BQ5105xB Datasheet by Texas Instruments

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V'.‘ 1!. B X E I TEXAS INSTRUMENTS

HOST

NTC PACK+

PACK-

bq5105xB

BAT

TERM

AD-EN

CHG

EN2

CBOOT1

CBOOT2

AC1

AC2

COMM2

CLAMP2

CCOMM2

CCLAMP2

COIL

BOOT1 RECT

TS/CTRL

BOOT2

CLAMP1

CCLAMP1

CCOMM1 COMM1

Bi-State

Tri-State

PGND

ILIM

RFOD

FOD

ROS

Wireless

Power

Transmitter

COIL

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

bq5105xB High-Efficiency Qi v1.2-Compliant Wireless Power Receiver

and Battery Charger

1 Features

1• Single-Stage Wireless Power Receiver

and Li-Ion/Li-Pol Battery Charger

– Combines Wireless Power Receiver, Rectifier,

and Battery Charger in a Single, Small

Package

– 4.20-V, 4.35-V, and 4.40-V Output Voltage

Options

– Supports a Charging Current up to 1.5 A

– 93% Peak AC-DC Charging Efficiency

• Robust Architecture

– 20-V Maximum Input Voltage Tolerance,

With Input Overvoltage Protection

– Thermal Shutdown and Overcurrent Protection

– Temperature Monitoring and Fault Detection

• Compatible With WPC v1.2 Qi Industry Standard

• Power Stage Output Tracks Rectifier and Battery

Voltage to Ensure Maximum Efficiency Across the

Full Charge Cycle

• Available in Small DSGBA and VQFN Packages

2 Applications

• Battery Packs

• Cell Phones and Smart Phones

• Headsets

• Portable Media Players

• Other Handheld Devices

3 Description

The bq5105x device is a high-efficiency, Qi-compliant

wireless power receiver with an integrated Li-Ion/Li-

Pol battery charge controller for portable applications.

The bq5105xB devices provide efficient AC-DC

power conversion, integrates the digital controller

required to comply with Qi v1.2 communication

protocol, and provides all necessary control

algorithms needed for efficient and safe Li-Ion and Li-

Pol battery charging. Together with the bq500212A

transmitter-side controller, the bq5105x enables a

complete wireless power transfer system for direct

battery charger solutions. By using near-field

inductive power transfer, the receiver coil embedded

in the portable device can pick up the power

transmitted by transmitter coil. The AC signal from

the receiver coil is then rectified and conditioned to

apply power directly to the battery. Global feedback

is established from the receiver to the transmitter to

stabilize the power transfer process. This feedback is

established by using the Qi v1.2 communication

protocol.

The bq5105xB devices integrate a low-impedance

synchronous rectifier, low-dropout regulator (LDO),

digital control, charger controller, and accurate

voltage and current loops in a single package. The

entire power stage (rectifier and LDO) use low-

resistance N-MOSFETs (100-mΩtypical Rdson) to

ensure high efficiency and low power dissipation.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

bq51050B

bq51051B

bq51052B

VQFN (20) 4.50 mm × 3.50 mm

DSBGA (28) 3.00 mm × 1.90 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Schematic

l TEXAS INSTRUMENTS

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bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Device Options....................................................... 4

6 Pin Configuration and Functions......................... 4

7 Specifications......................................................... 6

7.1 Absolute Maximum Ratings ...................................... 6

7.2 ESD Ratings.............................................................. 6

7.3 Recommended Operating Conditions....................... 6

7.4 Thermal Information.................................................. 6

7.5 Electrical Characteristics........................................... 7

7.6 Typical Characteristics............................................ 10

8 Detailed Description............................................ 13

8.1 Overview ................................................................. 13

8.2 Functional Block Diagram....................................... 14

8.3 Feature Description................................................. 14

8.4 Device Functional Modes........................................ 27

9 Application and Implementation ........................ 28

9.1 Application Information............................................ 28

9.2 Typical Application .................................................. 28

10 Power Supply Recommendations ..................... 33

11 Layout................................................................... 33

11.1 Layout Guidelines ................................................. 33

11.2 Layout Example .................................................... 33

12 Device and Documentation Support ................. 34

12.1 Documentation Support ........................................ 34

12.2 Related Links ........................................................ 34

12.3 Receiving Notification of Documentation Updates 34

12.4 Community Resources.......................................... 34

12.5 Trademarks........................................................... 34

12.6 Electrostatic Discharge Caution............................ 34

12.7 Glossary................................................................ 34

13 Mechanical, Packaging, and Orderable

Information ........................................................... 34

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision E (March 2015) to Revision F Page

• Changed all Qi v1.1 and WPC v1.1 To: Qi v1.2 and WPC v1.2 throughout the document................................................... 1

• Added the Adaptive Communication Limit section............................................................................................................... 24

• Deleted R1= 29.402 kΩR3= 14.302 kΩand added a link to SLUS629 in the Internal Temperature Sense (TS

Function of the TS/CTRL Pin) section ................................................................................................................................. 25

Changes from Revision D (January 2014) to Revision E Page

• Added ESD Ratings table, Feature Description section, Device Functional Modes,Application and Implementation

section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and

Mechanical, Packaging, and Orderable Information section.................................................................................................. 1

• Added the bq51052B 4.40-V option ....................................................................................................................................... 1

• Updated pinout images........................................................................................................................................................... 4

• Added thermal pad description in Pin Functions table........................................................................................................... 4

• Added AD voltage to Recommended Operating Conditions .................................................................................................. 6

• Changed RECT overvoltage specification name from VRECT to VOVP..................................................................................... 7

• Changed to ILIM_SHORT, OK from ILIM_SC for clarity...................................................................................................................... 7

• Added VOREG for bq51052B.................................................................................................................................................... 8

• Added minimum current for KILIM ............................................................................................................................................ 8

• Changed KILIM TYP value from 300 to 314 (min / max also changed)................................................................................... 8

• Added IBULK spec for charging minimum and maximum......................................................................................................... 8

• Added VRECH for bq51052B .................................................................................................................................................... 8

• Added new spec ITermination ...................................................................................................................................................... 8

• Changed to VTSB from VTS for clarity................................................................................................................................... 8

• Changed from ITS-Bias for clarity............................................................................................................................................... 8

• Deleted V0C-F as redundant..................................................................................................................................................... 8

• Changed typical JEITA regulation on bq51050B from 4.10 V to 4.06 V ................................................................................ 8

l TEXAS INSTRUMENTS

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Product Folder Links: bq51050B bq51051B bq51052B

• Changed to clarify CTRL pin high and low levels................................................................................................................... 8

• Changed Thermal shutdown name to TJ-SD for clarity ............................................................................................................ 9

• Added section to describe Adapter Enable function............................................................................................................... 9

• Changed Synchronous rectifer switchover name to IBAT-SR for clarity..................................................................................... 9

• Added synchronous mode entry for bq51052B...................................................................................................................... 9

• Deleted note regarding internal junction monitor reducing current - it is not applicable. ..................................................... 19

• Added section on modified JEITA profile for bq51052B....................................................................................................... 21

• Changed TS/CTRL function to correct Termination Packet value........................................................................................ 22

• Added Taper mode completion for Termination Packet....................................................................................................... 22

• Changed Beta value from 4500 to 3380 to match NTC datasheet ...................................................................................... 25

• Changed received power maximum error from 250 mW to 375 mW to comply with latest WPC v1.2 specification........... 27

Changes from Revision C (February 2013) to Revision D Page

• Changed the ABSOLUTE MAXIMUM RATINGS - moved AC1 and AC2 onto a single row with a Min value of –0.8 ......... 6

• Added section: Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow Diagrams............................ 15

• Changed text in the Battery Charge Profile section ............................................................................................................. 19

• Changed Battery failure Conditions in Table 1..................................................................................................................... 22

• Changed Equation 3 and Equation 4 ................................................................................................................................... 25

• Changed R2= 7.81 kΩTo: R1= 29.402 kΩ......................................................................................................................... 25

• Changed R3= 13.98 kΩTo: R3= 14.302 kΩin the Internal Temperature Sense (TS Function of the TS/CTRL Pin)

section .................................................................................................................................................................................. 25

• Changed THOT = 0°C To: THOT = 60°C.................................................................................................................................. 25

• Changed Equation 6............................................................................................................................................................. 29

Changes from Revision B (September 2012) to Revision C Page

• First release of the full data sheet.......................................................................................................................................... 1

Changes from Revision A (August 2012) to Revision B Page

• Changed last features bullet from: 1.9 x 3.0mm WCSP and 4.5 x 3.5mm QFN Package Options to: Available in

small WCSP and QFN packages ........................................................................................................................................... 1

• Changed Figure 1 and changed caption from: Wireless Power Consortium (WPC or Qi) Inductive Power Charging

System, to: Typical System blocks shows bq5105xB used as a Wireless Power Li-Ion/Li-Pol Battery Charger................... 1

• Added note: Visit ti.com/wirelesspower for product details and design resources................................................................. 1

Changes from Original (August 2012) to Revision A Page

• Changed Regulated BAT(output) voltage............................................................................................................................... 8

• Changed Recharge threshold for bq51052B.......................................................................................................................... 8

• Deleted ITS-Bias-Max.................................................................................................................................................................... 8

• Changed VCOLD to VOC and values ......................................................................................................................................... 8

• Changed V45C values.............................................................................................................................................................. 8

• Changed V60C values.............................................................................................................................................................. 8

• Changed Figure 25............................................................................................................................................................... 21

• Changed Figure 25............................................................................................................................................................... 22

l TEXAS INSTRUMENTS

1 2 3 4

PGND PGND PGND PGND

AC2 AC2 AC1 AC1

BOOT2 RECT RECT BOOT1

BAT BAT BAT BAT

COMM2 CLAMP2 CLAMP1 COMM1

TS/CTRL FOD AD-EN CHG

ILIM EN2 TERM AD

Thermal

Pad

2AC1

3BOOT1

4BAT

5CLAMP1

6COMM1

7CHG

8AD-EN

9AD

10TERM

11EN2

12 ILIM

13 TS/CTRL

14 FOD

15 COMM2

16 CLAMP2

17 BOOT2

18 RECT

19 AC2

20 PGND

1 PGND

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

5 Device Options

DEVICE FUNCTION VRECT-OVP VRECT-REG VBAT-REG NTC MONITORING

bq51050B 4.20-V Li-Ion Wireless Battery Charger 15 V Track 4.20 V JEITA

bq51051B 4.35-V Li-Ion Wireless Battery Charger 15 V Track 4.35 V JEITA

bq51052B 4.40-V Li-Ion Wireless Battery Charger 15 V Track 4.40 V Modified JEITA

6 Pin Configuration and Functions

YFP Package

28-Pin DSBGA

Top View

RHL Package

20-Pin VQFN With Exposed Thermal Pad

Top View

The exposed thermal pad should be

connected to ground.

l TEXAS INSTRUMENTS

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SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Pin Functions

Pin I/O DESCRIPTION

NAME DSBGA VQFN

AC1 B3, B4 2 I Input power from receiver coil.

AC2 B1, B2 19 I Input power from receiver coil.

AD G4 9 I If AD functionality is used, connect this pin to the wired adapter input. When VAD-Pres is applied to

this pin wireless charging is disabled and AD_ENn is driven low. Connect a 1-µF capacitor from AD

to PGND. If unused, the capacitor is not required and AD should be connected directly to PGND.

AD-EN F3 8 O Push-pull driver for external PFET when wired charging is active. Float if not used.

BAT

4 O Output pin, delivers power to the battery while applying the internal charger profile.

BOOT1 C4 3 O Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10-nF

ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2.

BOOT2 C1 17 O

CHG F4 7 O Open-drain output – active when BAT is enabled. Float if not used.

CLAMP1 E3 5 O Open-drain FETs which are used for a non-power dissipative overvoltage AC clamp protection.

When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will

act as a low impedance to protect the device from damage. If used, capacitors are used to connect

CLAMP1 to AC1 and CLAMP2 to AC2. Recommended connections are 0.47-µF capacitors.

CLAMP2 E2 16 O

COMM1 E4 6 O Open-drain outputs used to communicate with primary by varying reflected impedance. Connect a

capacitor from COMM1 to AC1 and a capacitor from COMM2 to AC2 for capacitive load modulation.

For resistive modulation connect COMM1 and COMM2 to RECT through a single resistor. See

Communication Modulator for more information.

COMM2 E1 15 O

EN2 G2 11 I Used to set priority between wireless power and wired power. EN2 low enables wired charging

source if AD input voltage is present. EN2 high disables wired charging source and wireless power

is enabled if present.

FOD F2 14 I Input for the rectified power measurement. See WPC v1.2 Compatibility for details.

ILIM G1 12 I/O Programming pin for the battery charge current. The total resistance from ILIM to PGND (RILIM) sets

the charge current. Figure 32 shows RILIM to be R1+ RFOD. Details can be found in Electrical

Characteristics and Battery Charge Current Setting Calculations.

PGND

1, 20 – Power ground

RECT C2, C3 18 O Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND.

Depending on the power levels, the value may be from 4.7 μF to 22 μF.

TERM G3 10 I Input that is used to set the termination threshold. Termination current is the battery current level

below which the charge process will cease. The termination current is set as a percentage of the

charge current. See Battery Charge Current Setting Calculations for more details.

TS/CTRL F1 13 I

Temperature Sense (TS) and Control (CTRL) pin functionality. For the TS functionality connect

TS/CTRL to ground through a Negative Temperature Coefficient (NTC) resistor. If an NTC function

is not desired, connect to PGND with a 10-kΩresistor. As a CTRL pin pull low to send end power

transfer (EPT) fault to the transmitter or pull up to an internal rail to send EPT termination to the

transmitter. See Internal Temperature Sense (TS Function of the TS/CTRL Pin) for more details.

— — PAD — The exposed thermal pad should be connected to ground (PGND).

l TEXAS INSTRUMENTS

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating

Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltages are with respect to the VSS terminal, unless otherwise noted.

7 Specifications

7.1 Absolute Maximum Ratings(1)(2)

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Input voltage

RECT, COMM1, COMM2, BAT, CHG, CLAMP1, CLAMP2 –0.3 20 V

AC1, AC2 –0.8 20 V

AD, AD-EN –0.3 30 V

BOOT1, BOOT2 –0.3 26 V

EN2, TERM, FOD, TS/CTRL, ILIM –0.3 7 V

Input current AC1, AC2 2 A(RMS)

Output current BAT 1.5 A

Output sink current CHG 15 mA

COMM1, COMM2 1.0 A

Junction temperature, TJ–40 150 °C

Storage temperature, Tstg –65 150 °C

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.2 ESD Ratings

VALUE UNIT

V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V

Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±500

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

VIN Input voltage range RECT 4 10 V

IIN Input current Internal Rectifier (voltage monitored at RECT node) 1.5 A

IBAT BAT(output) current BAT bq51050B, bq51051B 1.5 A

bq51052B 0.8

VAD Adapter voltage AD 15 V

IAD-EN Sink current AD-EN 1 mA

ICOMM COMM sink current COMM 500 mA

TJJunction temperature 0 125 °C

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

7.4 Thermal Information

THERMAL METRIC(1)

bq51050B, bq51051B, bq51052B

UNITYFP (DSGBA) RHL (VQFN)

28 PINS 20 PINS

RθJA Junction-to-ambient thermal resistance 58.9 37.7 °C/W

RθJC(top) Junction-to-case (top) thermal resistance 0.2 35.5 °C/W

RθJB Junction-to-board thermal resistance 9.1 13.6 °C/W

ψJT Junction-to-top characterization parameter 1.4 0.5 °C/W

ψJB Junction-to-board characterization parameter 8.9 13.5 °C/W

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Product Folder Links: bq51050B bq51051B bq51052B

Thermal Information (continued)

THERMAL METRIC(1)

bq51050B, bq51051B, bq51052B

UNITYFP (DSGBA) RHL (VQFN)

28 PINS 20 PINS

RθJC(bot) Junction-to-case (bottom) thermal resistance n/a 2.7 °C/W

(1) VRECT-REG is overridden when rectifier foldback mode is active (VRECT-REG-VTRACK).

7.5 Electrical Characteristics

Over junction temperature range 0°C ≤TJ≤125°C and recommended supply voltage (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VUVLO Undervoltage lockout VRECT: 0 V →3 V 2.6 2.7 2.8 V

VHYS-UVLO Hysteresis on UVLO VRECT: 3 V →2 V 250 mV

VOVP Input overvoltage threshold VRECT: 5 V →16 V 14.5 15 15.5 V

VHYS-OVP Hysteresis on OVP VRECT: 16 V →5 V 150 mV

VRECT-REG(1) VRECT regulation voltage 5.11 V

ILOAD ILOAD Hysteresis for dynamic VRECT thresholds as a %

of IILIM ILOAD falling 5%

VTRACK Tracking VRECT regulation above VBAT VBAT = 3.5 V,

IBAT ≥500 mA 300 mV

VRECT-REV Rectifier reverse voltage protection at the BAT(output) VRECT-REV = VBAT – VRECT,

VBAT = 10 V 8.3 9 V

VRECT-DPM Rectifier undervoltage protection, restricts IBAT at

VRECT-DPM 3 3.1 3.2 V

QUIESCENT CURRENT

IRECT Active chip quiescent current consumption from RECT

(when wireless power is present)

IBAT = 0 mA, 0°C ≤TJ≤85°C 8 10 mA

IBAT = 300 mA, 0°C ≤TJ≤85°C 2 3 mA

IQQuiescent current at the BAT when wireless power is

disabled (Standby) VBAT = 4.2 V, 0°C ≤TJ≤85°C 12 20 µA

ILIM SHORT PROTECTION

RILIM-SHORT

Highest value of ILIM resistor considered a fault

(short).

Monitored for IBAT > ILIM_SHORT, OK

RILIM: 200 Ω→50 Ω. IBAT

latches off, cycle power to

reset

bq51050B,

bq51051B 120 Ω

bq51052B 235

tDGL-Short Deglitch time transition from ILIM short to IBAT disable 1 ms

ILIM_SHORT,

ILIM-SHORT,OK enables the IILIM short comparator when

IBAT is greater than this value IBAT: 0 mA →200 mA

bq51050B,

bq51051B 110 145 165 mA

bq51052B 55 75 95

ILIM-SHORT,

HYSTERESIS

Hysteresis for ILIM-SHORT,OK comparator IBAT: 200 mA →0 mA 30 mA

IBAT-CL Maximum output current limit Maximum IBAT that will be delivered for up

to 1 ms when ILIM is shorted to PGND 2.4 A

BATTERY SHORT PROTECTION

VBAT(SC) BAT pin short-circuit detection/precharge threshold VBAT:3V→0.5 V, no deglitch 0.75 0.8 0.85 V

VBAT(SC)-HYS VBAT(SC) hysteresis VBAT: 0.5 V →3 V 100 mV

IBAT(SC) Source current to BAT pin during short-circuit

detection VBAT = 0 V

bq51050B,

bq51051B 12 18 22 mA

bq51052B 12 18 25

VOLTAGE REGULATION PHASE

IEndTrack IBAT threshold during Voltge Regulation Phase that

changes VRECT level from VBAT+VTRACK to VRECT-REG IBAT decreasing

bq51050B,

bq51051B 0.35 *

IBULK mA

bq51052B 0.05 *

IBULK

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Electrical Characteristics (continued)

Over junction temperature range 0°C ≤TJ≤125°C and recommended supply voltage (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

PRECHARGE

VLOWV Precharge to fast charge transition threshold VBAT:2V→4 V 2.9 3.0 3.1

KPRECHG Precharge current as a percentage of the programmed

charge current setting (IBULK)VLOWV > VBAT > VBAT(SC)

IBAT: 50 mA – 300 mA 18% 20% 23%

IPRECHG IBAT during precharge VLOWV > VBAT > VBAT(SC), IBULK = 500 mA 100 mA

tprecharge Precharge time-out VBAT(SC) < VBAT < VLOWV 30 min

tDGL1(LOWV) Deglitch time, pre- to fast-charge 25 ms

tDGL2(LOWV) Deglitch time, fast- to precharge 25 ms

OUTPUT

VOREG Regulated BAT(output) voltage IBAT = 1000 mA

bq51050B 4.16 4.20 4.22

Vbq51051B 4.30 4.35 4.37

bq51052B 4.36 4.40 4.44

VDO Drop-out voltage, RECT to BAT IBAT = 1 A 110 190 mV

KILIM Current programming factor

RLIM = KILIM / IIBULK (500

mA - 1.5 A) bq51050B,

bq51051B 303 314 321 AΩ

RLIM = KILIM / IIBULK (500

mA - 1.0 A) bq51052B

IBULK Battery charging current limits KILIM 303 to 321

bq51050B,

bq51051B 500 1,500 mA

bq51052B 500 1,000

tfast-charge Fast-charge timer VLOWV < VBAT < VBAT-REG 10 hours

IBAT-R Battery charge current limit programming range 1500 mA

ICOMM-CL Current limit during communication 330 390 420 mA

TERMINATION

KTERM Programmable termination current as a percentage of

IIBULK RTERM = %IIBULK x KTERM (IBULK = 500 mA) 200 240 280 Ω/%

ITERM-Th Termination current from BAT, defined with KTERM, as

the current that terminates the charge cycle IBAT decreasing, RTERM = 2.4k Ω, IBULK =

1000 mA 100 mA

ITERM Constant current at the TERM pin to bias the

termination reference 40 50 55 µA

VRECH Recharge threshold

bq51050B VBAT-REG

–135mV VBAT-REG

–110mV VBAT-REG

–90mV V

bq51051B VBAT-REG

–125mV VBAT-REG

–95mV VBAT-REG

–70mV

bq51052B VBAT-REG

–125mV VBAT-REG

–95mV VBAT-REG

–70mV

ITermination Termination current setting limits 120 mA

TS / CTRL FUNCTIONALITY

VTSB Internal TS bias voltage (VTS is the voltage at the

TS/CTRL pin, VTSB is the internal bias voltage) ITSB< 100 µA (periodically

driven see tTS/CTRL-Meas)2 2.2 2.4 V

V0C-R Rising threshold VTS: 50% →60% 57 58.7 60 %VTSB

V0C-Hyst Hysteresis on 0°C Comparator VTS: 60% →50% 2.4 %VTSB

V10C Rising threshold VTS: 40% →50% 46 47.8 49 %VTSB

V10C-Hyst Hysteresis on 10°C Comparator VTS: 50% →40% 2 %VTSB

V45C Falling threshold VTS: 25% →15% 18 19.6 21 %VTSB

V45C-Hyst Hysteresis on 45°C Comparator VTS: 15% →25% 3 %VTSB

V60C Falling threshold VTS: 20% →5% 12 13.1 14 %VTSB

V60C-Hyst Hysteresis on 60°C Comparator VTS: 5% →20% 1 %VTSB

I45C IBULK reduction percentage at 45°C (in full JEITA mode

- N/A for bq51052B) VTS: 25% →15%, IBAT = IBULK 45% 50% 55%

VO-J Voltage regulation during JEITA temperature range

bq51050B 4.06

Vbq51051B 4.2

bq51052B 4.2

VCTRL-HI Voltage on CTRL pin for a high 0.2 5 V

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Product Folder Links: bq51050B bq51051B bq51052B

Electrical Characteristics (continued)

Over junction temperature range 0°C ≤TJ≤125°C and recommended supply voltage (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VCTRL-LOW Voltage on CTRL pin for a low 0 0.1 V

tTS/CTRL-Meas Time period of TS/CTRL measurements (when VTSB is

being driven internally) TS bias voltage is only driven when

communication packets are sent 24 ms

tTS-Deglitch Deglitch time for all TS comparators 10 ms

NTC-Pullup Pullup resistor for the NTC network. Pulled up to the

TS bias LDO. 18 20 22 kΩ

NTC-RNOM Nominal resistance requirement at 25°C of the NTC

resistor 10 kΩ

NTC-Beta Beta requirement for accurate temperature sensing

through the above specified thresholds 3380 Ω

THERMAL PROTECTION

TJ-SD Thermal shutdown temperature 155 °C

TJ-Hys Thermal shutdown hysteresis 20 °C

OUTPUT LOGIC LEVELS ON CHG

VOL Open-drain CHG pin ISINK = 5 mA 500 mV

IOFF,CHG CHG leakage current when disabled VCHG = 20 V,

0°C ≤TJ≤85°C 1 µA

COMM PIN

RDS-

ON(COMM) COMM1 and COMM2 VRECT = 2.6 V 1 Ω

fCOMM Signaling frequency on COMM pin 2 kb/s

IOFF,COMM COMM pin leakage current VCOMM1 = 20 V,

VCOMM2 = 20 V 1 µA

CLAMP PIN

RDS-

ON(CLAMP) CLAMP1 and CLAMP2 0.75 Ω

ADAPTER ENABLE

VAD-Pres VAD Rising threshold voltage. EN-UVLO VAD 0 V →5 V 3.5 3.6 3.8 V

VAD-PresH VAD-Pres hysteresis, EN-HYS VAD 5 V →0 V 400 mV

IAD Input leakage current VRECT = 0 V, VAD = 5 V 60 µA

RAD Pullup resistance from AD-EN to BAT when adapter

mode is disabled and VBAT > VAD, EN-OUT VAD = 0 V, VBAT = 5 V 200 350 Ω

VAD-Diff Voltage difference between VAD and VAD-EN when

adapter mode is enabled, EN-ON VAD = 5 V, 0°C ≤TJ≤85°C 3 4.5 5 V

SYNCHRONOUS RECTIFIER

IBAT-SR IBAT at which the synchronous rectifier enters half

synchronous mode, SYNC_EN IBAT 200 mA →0 mA

bq51050B,

bq51051B 80 115 140

bq51052B 20 50 65

IBAT-SRH Hysteresis for IBAT,SR (full-synchronous mode enabled) IBAT 0 mA →200 mA

bq51050B,

bq51051B 25

bq51052B 28

VHS-DIODE High-side diode drop when the rectifier is in half

synchronous mode IAC-VRECT = 250 mA, and TJ= 25°C 0.7 V

EN2

VIL Input low threshold for EN2 0.4 V

VIH Input high threshold for EN2 1.3 V

RPD, EN EN2 pulldown resistance 200 kΩ

ADC

PowerREC Received power measurement 0 W – 5 W received power after calibration

of Rx magnetics losses 0.25 W

l TEXAS INSTRUMENTS Dutpm Pawer (w) 100 ompux Pawev (w) 5,50 N ompux Current (A) —> —> Output Cunem (A) F/ Outpm Current (A) Ouipul Powev (w)

012 3 4

Efficiency (%)

Output Power (W)

Pre-charge & fast charge mode

Taper mode

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

0 0.2 0.4 0.6 0.8 11.2

Output Ripple (V)

Output Current (A)

1.0

2.0

3.0

4.0

5.0

6.0

0.0 0.1 0.2 0.3 0.4 0.5 0.6

Rectifier Voltage (V)

Output Current (A)

Pre-charge & fast charge mode

Taper mode

R =600

ILIM W

1.50

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

0.00 0.20 0.40 0.60 0.80 1.00

Vrect and Vbat (V)

Output Current (A)

Precharge & fast charge mode

Taper mode

Vrect

Vbat

100

0.00 1.00 2.00 3.00 4.00 5.00

Efficiency (%)

Output Power (W)

Pre-charge & fast charge mode

Taper mode

100

012 3 45

Efficiency (%)

Output Power (W)

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

7.6 Typical Characteristics

Figure 1. Rectifier Efficiency Figure 2. IC Efficiency (AC Input to DC Output)

Figure 3. VRECT, VBAT versus Output Current Figure 4. VRECT versus Output Current at RILIM=600 Ω(ILIM =

523 mA)

Figure 5. Output Ripple versus Output Current Figure 6. System Efficiency (DC Input to DC Output)

l TEXAS INSTRUMENTS um. um. mm mm Teksvup Q7 mm: mum TekPreVu —‘~—~ WW: Mummy . , , , , i )1 WU_LU'_UMULNL_U_L [p m I: Vuct /' V / , I vw —‘ E max—J / .mv w ham 5 079an mm m mm mm \ iWﬂFIIW—“IIWFW E m —‘ Imv w .. um I. .osnnmv moms lamv [ism

VRECT

VBAT

IBAT

VRECT

VBAT

IBAT

VBAT (V)

Efficiency

3 3.3 3.6 3.9 4.2 4.5

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

D001

IBAT during Taper Mode (A)

Efficiency

0 0.2 0.4 0.6 0.8 1

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

D001

VBAT (V)

Efficiency

3 3.3 3.6 3.9 4.2 4.5

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

D001

IBAT during Taper Mode (A)

Efficiency

0 0.06 0.12 0.18 0.24 0.3

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

D001

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Typical Characteristics (continued)

Figure 7. bq51052B 300-mA Fast Charge Efficiency (DC

Input to DC Output) Figure 8. bq51052B 300-mA Taper Charge Efficiency (DC

Input to DC Output)

Figure 9. bq51052B 800-mA Fast Charge Efficiency (DC

Input to DC Output) Figure 10. bq51052B 800-mA Taper Charge Efficiency (DC

Input to DC Output)

Figure 11. Battery Insertion in Precharge Mode Figure 12. Battery Insertion in Fast-Charge Mode

l TEXAS INSTRUMENTS Tekxm —'— um Ilweflm Mm —'— um Ilweflm ' : , . a m ' ' "/ ' a nu / um 944 N SEW N ' ZWV W I) Saw A. ' wuv gnaw mums mm um sonmv gnaw mm mm 21an mm + mm mm Teksvop —'— um WNW W W /. L3 WI .v.+§e+au1uu1{|uulzlyiH/MJIIIJllHJ\ H WIN” - "WHIIWIIIIIIIWII IIIMHIWH | ‘ W1“. ‘ ‘ m‘mmnnn‘ ‘ ‘ m _ E“ _ \WV I4 I. {WV N 7 NW N .l SWV €091th 2110; [MW $2358 g ”111V .WV US [WW 5820 Telnmp —'— mm: mm Teksmp é Mum Mam WWW ‘ 2' |D Wm / v D W“ mm W @w‘ ’ ’ ‘ , Elm smv nsmv u ' numv B4 mv .umv w: Inmv M 9mm ”WV 215!

VRECT

IBAT

VBAT

VTS/CTRL

VRECT

VBAT

IBAT

VRECT

VBAT

IBAT

VRECT

VBAT

IBAT

VTS/CTRL

VRECT

VBAT

IBAT

VTS/CTRL

VRECT

VBAT

IBAT

VTS/CTRL

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Typical Characteristics (continued)

Figure 13. TS Fault Figure 14. TS Ground Fault

Figure 15. Precharge to Fast-Charge Transition Figure 16. JEITA Functionality (Rising Temp) -

bq51050B/bq51051B

Figure 17. JEITA Functionality (Falling Temp) -

bq51050B/bq51051B Figure 18. Battery Short to Precharge Mode Transition

l TEXAS INSTRUMENTS Contml‘ev

AC to DC

Voltage/

Current

Conditioning

Controller

RectificationDrivers System

Controller V/I

Sense

Power

Transmitter Receiver

bq5105x

bq500210

Communication

Battery

Charger

LI-Ion

Battery

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

8 Detailed Description

8.1 Overview

8.1.1 A Brief Description of the Wireless System

A wireless system consists of a charging pad (primary, transmitter) and the secondary-side equipment. There are

coils in the charging pad and in the secondary equipment which magnetically couple to each other when the

equipment is placed on the charging pad. Power is transferred from the primary to the secondary by transformer

action between the coils. Control over the amount of power transferred is achieved by changing the frequency of

the primary drive.

The secondary can communicate with the primary by changing the load seen by the primary. This load variation

results in a change in the primary coil current, which is measured and interpreted by a processor in the charging

pad. The communication is digital - packets are transferred from the secondary to the primary. Differential bi-

phase encoding is used for the packets. The rate is 2-kbps.

Various types of communication packets have been defined. These include identification and authentication

packets, error packets, control packets, power usage packets, end of power packet and efficiency packets.

The primary coil is powered off most of the time. It wakes up occasionally to see if a secondary is present. If a

secondary authenticates itself to the primary, the primary remains powered up. The secondary maintains full

control over the power transfer using communication packets.

Figure 19. WPC Wireless Power Charging System Indicating the Functional Integration of the bq5105x

l TEXAS INSTRUMENTS PGND

ILIM

BAT

VREFAD,OVP

VREFAD,UVLO

AD-EN

VREF_100MV

TS_0

TS_10

TS_DETECT

VREF,TS-BIAS FOD

TS/CTRL

ADC

VREF,IABS

VIN,DPM

VOUT,REG

VOUT,FB

VILIM

VREF,ILIM

VIABS,FB

VIN,FB

VBG,REF

VIN,FB

VOUT,FB

VILIM

VIABS,FB

VIC,TEMP

VIABS,REF

Sync

Rectifier

Control

AC1

AC2

BOOT1

BOOT2

RECT

Digital Control

and Charger

DATA_

OUT

COMM1

COMM2

PGND

CLAMP1

CLAMP2

TERM

EN2

200k:

CHG

VFOD

50µ A

ILIM

VRECT

VOVP,REF

OVP

TERM

TS_45

TS_60

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Using the bq5105x as a Wireless Li-Ion/Li-Pol Battery Charger (With Reference to Functional Block

Diagram)

Functional Block Diagram is the schematic of a system which uses the bq5105x as a direct battery charger.

When the system shown in Functional Block Diagram is placed on the charging pad (transmitter), the receiver

coil couples to the magnetic flux generated by the coil in the charging pad which consequently induces a voltage

in the receiver coil. The internal synchronous rectifier feeds this voltage to the RECT pin which has the filter

capacitor C3.

l TEXAS INSTRUMENTS

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

The bq5105x identifies and authenticates itself to the primary using the COMM pins by switching on and off the

COMM FETs and hence switching in and out CCOMM. If the authentication is successful, the transmitter will

remain powered on. The bq5105x measures the voltage at the RECT pin, calculates the difference between the

actual voltage and the desired voltage VRECT-REG and sends back error packets to the primary. This process goes

on until the RECT voltage settles at VRECT-REG.

During power-up, the LDO is held off until the VRECT-REG threshold converges. The voltage control loop ensures

that the output (BAT) voltage is maintained at VBAT-REG. The values of VBAT and VRECT are dependant on the

battery charge mode. The bq5105x continues to monitor the VRECT and VBAT and sends error packets to the

primary every 250 ms. The bq5105x regulates the VRECT voltage very close to battery voltage, this voltage

tracking process minimizes the voltage difference across the internal LDO and maximizes the charging efficiency.

If a large transient occurs, the feedback to the primary speeds up to every 32 ms in order to converge on an

operating point in less time.

8.3.2 Details of a Qi Wireless Power System and bq5105xB Power Transfer Flow Diagrams

The bq5105xB integrates a fully compliant WPC v1.2 communication algorithm in order to streamline receiver

designs (no extra software development required). Other unique algorithms such as Dynamic Rectifier Control

are also integrated to provide best-in-class system performance. This section provides a high level overview of

these features by illustrating the wireless power transfer flow diagram from start-up to active operation.

During start-up operation, the wireless power receiver must comply with proper handshaking to be granted a

power contract from the TX. The TX will initiate the handshake by providing an extended digital ping. If an RX is

present on the TX surface, the RX will then provide the signal strength, configuration and identification packets to

the TX (see volume 1 of the WPC specification for details on each packet). These are the first three packets sent

to the TX. The only exception is if there is a shutdown condition on the EN1/EN2, AD, or TS/CTRL pins where

the Rx will shut down the TX immediately. Once the TX has successfully received the signal strength,

configuration and identification packets, the RX will be granted a power contract and is then allowed to control

the operating point of the power transfer. With the use of the bq5105xB Dynamic Rectifier Control algorithm, the

RX will inform the TX to adjust the rectifier voltage above 5 V before enabling the output supply. This method

enhances the transient performance during system start-up. See Figure 20 for the start-up flow diagram details.

‘5‘ TEXAS INSTRUMENTS \ ¢ C} O] <><>

TX Powered

without RX

Active

Identification &

Configuration & SS, Received

by TX?

YES

TX Extended Digital Ping

Power Contract Established.

All proceeding control is

dictated by the RX.

VRECT < VRECT-REG ? Send control error packet to

increase VRECT

YES

Startup operating point

established. Enable the RX

output.

EN2/AD/TS/CTRL EPT

Condition?

Send EPT packet with

reason value

YES

RX Active Power

Transfer Stage

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

Figure 20. Wireless Power Start-up Flow Diagram

‘5‘ TEXAS INSTRUMENTS 0 WW

RX Shutdown

conditions per

the EPT Table?

Send EPT packet with

reason value

YES

VBAT < VLOWV

VRECT target = VRECT-REG.

Send control error packets

to converge.

YES

IBAT > KPRECHG% of IBULK?

VRECT target = VBAT + VTRACK.

Send control error packets

to converge.

YES

VRECT target = VRECT-REG.

Send control error packets

to converge.

RX Active Power

Transfer Stage

TX Powered

without RX

Active

Measure Rectified Power

and Send Value to TX

TERM STATE

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

Once the start-up procedure has been established, the RX will enter the active power transfer stage. This is

considered the “main loop” of operation. The Dynamic Rectifier Control algorithm will determine the rectifier

voltage target based on a percentage of the maximum output current level setting (set by KILIM and the IILIM

resistance to PGND). The RX will send control error packets in order to converge on these targets. As the output

current changes, the rectifier voltage target will dynamically change. As a note, the feedback loop of the WPC

system is relatively slow where it can take up to 90 ms to converge on a new rectifier voltage target. It should be

understood that the instantaneous transient response of the system is open loop and dependent on the RX coil

output impedance at that operating point. More details on this will be covered in the section Receiver Coil Load-

Line Analysis. The “main loop” will also determine if any conditions are true and will then discontinue the power

transfer. Figure 21 shows the active power transfer loop.

Figure 21. Active Power Transfer Flow Diagram

l TEXAS INSTRUMENTS OWN Q

Power

Transfer

VILIM < VTERM?VBAT > VRECH?

YES YES Send EPT Charge

Complete

VBAT < VBAT(SC)

VRECT Target = VRECT-REG

IBAT = IBAT(SC)

YES

VBAT(SC) < VBAT < VLOWV

VRECT Target = VRECT-REG

IOUT = IPRECHG

YES

VLOWV < VBAT < VOREG

VRECT Target = VBAT + VTRACK

IBAT = IBULK

YES

IBAT < IEndTrack?

VRECT Target = VRECT-REG

YES

AD / TS/CTRL

EPT Condition? Send EPTYES

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

Figure 22. TERM STATE Flow Diagram of bq5105XB

l TEXAS INSTRUMENTS

Pre-charge

Phase Current Regulation Phase

VBAT(SC)

VLOWV

VOREG

VRECT-REG

VRECT-TRACK

VRECT-REG TX Off

ITERM-Th

IPRECHG

IBAT(SC)

IBulk

VRECT = VRECT-REG

VRECT =

VBAT + VTRACK

VRECT = VBAT + VTRACK

VBAT

VBAT = VOREG

VBAT

IBAT

IBAT = IBULK

IBAT = Taper

IBAT = Off

Voltage Regulation Phase

Pre-charge

Phase Current Regulation Phase Voltage Regulation Phase

VBAT(SC)

VLOWV

VOREG

VRECT-REG

VRECT-TRACK

VRECT-REG

Exits

VRECT-TRACK

TX Off

ITERM-Th

IPRECHG

IBAT(SC)

IEndTrack

IBulk

VRECT = VRECT-REG

VRECT =

VBAT + VTRACK

VRECT = VBAT + VTRACK VRECT = VRECT-REG

VBAT

VBAT = VOREG

VBAT

IBAT

IBAT = IBULK

IBAT = Taper

IBAT = Off

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

8.3.3 Battery Charge Profile

The battery is charged in three phases: precharge, fast-charge constant current and constant voltage. A voltage-

based battery pack thermistor monitoring input (TS function of the TS/CTRL pin) is included that monitors battery

temperature for safe charging. The TS function for bq51050B and bq51051B is JEITA compatible. The TS

function for the bq51052B modifies the current regulation differently than standard JEITA. See Battery-Charger

Safety and JEITA Guidelines for more details.

The rectifier voltage follows BAT voltage plus VTRACK for any battery voltage above VLOWV to full regulation

voltage and most of the taper charging phase. If the battery voltage is below VLOWV the rectifier voltage increases

to VRECT-REG.

If IBAT is less than IEndTrack (a percentage of IBULK) during taper mode, the rectifier voltage increases to VRECT-REG.

The charge profile for the bq51050B and bq51051B is shown in Figure 23 while the bq51052B is shown in

Figure 24.

Figure 23. bq51050B and bq51051B Li-Ion Battery Charge Profile

Figure 24. bq51052B Li-Ion Battery Charge Profile

l TEXAS INSTRUMENTS KTERM

RTERM = KTERM * %IBULK %IBULK = RTERM

KTERM

RILIM = R1 + RFOD

R1 = t RFOD

KILIM

IBULK

IBULK =

KILIM

RILIM

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

8.3.4 Battery Charging Process

8.3.4.1 Precharge Mode (VBAT ≤VLOWV)

The bq5105X enters precharge mode when VBAT ≤VLOWV. Upon entering precharge mode, battery charge

current limit is set to IPRECHG. During precharge mode, the charge current is regulated to KPRECHG percent of the

fast charge current (IBULK) setting. For example, if IBULK is set to 800 mA, then the precharge current would

have a typical value of 160 mA.

If the battery is deeply discharged or shorted (VBAT < VBAT(SC)), the bq5105X applies IBAT(SC) current to bring the

battery voltage up to acceptable charging levels. Once the battery rises above VBAT(SC), the charge current is

regulated to IPRECHG.

Under normal conditions, the time spent in this precharge region is a very short percentage of the total charging

time and this does not affect the overall charging efficiency for very long.

8.3.4.2 Fast Charge Mode / Constant Voltage Mode

Once VBAT > VLOWV, the bq5105x enters fast charge mode (Current Regulation Phase) where charge current is

regulated using the internal MOSFETs between RECT and BAT. Once the battery voltage charges up to VBAT-

REG, the bq5105x enters constant voltage (CV) phase and regulates battery voltage to VOREG and the charging

current is reduced.

Once IBAT falls below the termination threshold (ITERM-Th), the charger sends an EPT (Charge Complete)

notification to the TX and enters high impedance mode.

8.3.4.3 Battery Charge Current Setting Calculations

8.3.4.3.1 RILIM Calculations

The bq5105x includes a means of providing hardware overcurrent protection by means of an analog current

regulation loop. The hardware current limit provides an extra level of safety by clamping the maximum allowable

output current (for example, a current compliance). The calculation for the total RILIM resistance is as follows:

(1)

Where IBULK is the programmed battery charge current during fast charge mode. When referring to the application

diagram shown in Figure 32, RILIM is the sum of RFOD and R1(the total resistance from the ILIM pin to PGND).

8.3.4.3.2 Termination Calculations

The bq5105X includes a programmable upper termination threshold. The upper termination threshold is

calculated using Equation 2:

(2)

The KTERM constant is specified in Electrical Characteristics as 240 Ω/%. The upper termination threshold is set

as a percentage of the charge current setting (IBULK).

For example, if RILIM is set to 314 Ω, IBULK will be 1 A (314 ÷ 314). If the upper termination threshold is desired to

be 100 mA, this would be 10% of IBULK. The RTERM resistor would then equal 2.4 kΩ(240 × 10).

Termination can be disabled by floating the TERM pin. If the TERM pin is grounded the termination function is

effectively disabled. However, due to offsets of internal comparators, termination may occur at low battery

currents.

l TEXAS INSTRUMENTS (c' m (,0, q [45 a my q

0 V

Charge Voltage: VOREG

VO-J

Charge Current: IBULK

0 A

(0° C)

(10° C)

(45° C)

(60° C)

IBULK / 2IBULK / 2

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

8.3.4.4 Battery-Charger Safety and JEITA Guidelines

The bq5105x continuously monitors battery temperature by measuring the voltage between the TS/CTRL pin and

PGND. A negative temperature coefficient thermistor (NTC) and an external voltage divider typically develop this

voltage. The bq5105x compares this voltage against its internal thresholds to determine if charging is allowed. To

initiate a charge cycle, the voltage on TS/CTRL pin (VTS) must be within the VT1 to VT4 thresholds. If VTS is

outside of this range, the bq5105x suspends charge and waits until the battery temperature is within the VT1 to

VT4 range. Additional information on the Temperature Sense function can be found in Internal Temperature

Sense (TS Function of the TS/CTRL Pin).

8.3.4.4.1 bq51050B and bq51051B JEITA

If VTS is within the ranges of VT1 and VT2 or VT3 and VT4, the charge current is reduced to IBULK/2. If VTS is within

the range of VT1 and VT3, the maximum charge voltage regulation is VOREG. If VTS is within the range of VT3 and

VT4, the maximum charge voltage regulation is reduced to "NEW SPEC". Figure 25 summarizes the operation.

Figure 25. JEITA Compatible TS Profile for bq51050B and bq51051B

8.3.4.4.2 bq51052B Modified JEITA

The bq51052B has a modififed JEITA profile. The maximum charge current is not modified between VT1 and VT2

or between VT3 and VT4, it remains at IBULK. The maximum charge voltage is reduced to VO-J when the VTS is

between VT3 and VT4.

l TEXAS INSTRUMENTS (o' m (m' q [45 q (50' q

0 V

Charge Voltage: VOREG

VO-J

Charge Current: IBULK

0 A

(0° C)

(10° C)

(45° C)

(60° C)

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Feature Description (continued)

Figure 26. JEITA Compatible TS Profile for bq51052B

8.3.4.5 Input Overvoltage

If, for some condition (for example, a change in position of the equipment on the charging pad), the rectifier

voltage suddenly increases in potential, the voltage-control loop inside the bq5105x becomes active, and

prevents the output from going beyond VBAT-REG. The receiver then starts sending back error packets every 32

ms until the RECT voltage comes back to an acceptable level, and then maintains the error communication every

250 ms.

If the input voltage increases in potential beyond VOVP, the device switches off the internal FET and

communicates to the primary to bring the voltage back to VRECT-REG. In addition a proprietary voltage protection

circuit is activated by means of CCLAMP1 and CCLAMP2 that protects the device from voltages beyond the maximum

rating.

8.3.4.6 End Power Transfer Packet (WPC Header 0x02)

The WPC allows for a special command to terminate power transfer from the TX termed End Power Transfer

(EPT) packet. WPC v1.2 specifies the reasons for sending a termination packet and their data field value. In

Table 1, the CONDITION column corresponds to the stimulus causing the bq5105x device to send the

hexidecimal code in the VALUE column.

Table 1. Termination Packets

REASON VALUE CONDITION

Unknown 0x00 AD > VAD-Pres, TS/CTRL = VCTRL-HI

Charge Complete 0x01 IBAT falls below ITERM-Th during Taper mode

Internal Fault 0x02 TJ> 150°C or RILIM < RILIM-SHORT

Overtemperature 0x03 TS < VHOT, TS > VCOLD, or TS/CTRL < VCTRL-LOW

Overvoltage 0x04 Not Sent

Overcurrent 0x05 Not Sent

Battery failure 0x06 Battery is not coming out of precharge mode after Precharge time-out, or

fast charge time-out has occured.

Reconfigure 0x07 Not Sent

No Response 0x08 VRECT target does not converge

‘5‘ TEXAS INSTRUMENTS

COMM1 COMM2

RECTIFIER

24 :24 :

COMM_DRIVE

COMM1 COMM2

COMM_DRIVE

AC1 AC2

47 nF 47 nF

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

8.3.4.7 Status Output

The bq5105x provides one status output, CHG. This output is an open-drain NMOS device that is rated to 20 V.

The open-drain FET connected to the CHG pin will be turned on whenever the output (BAT) of the charger is

enabled. As a note, the output of the charger supply will not be enabled if the VRECT-REG does not converge to the

no-load target voltage.

8.3.4.8 Communication Modulator

The bq5105x provides two identical, integrated communication FETs which are connected to the pins COMM1

and COMM2. These FETs are used for modulating the secondary load current which allows bq5105x to

communicate error control and configuration information to the transmitter.There are two methods to implement

load modulation, capacitive and resistive.

Capacitive load modulation is more commonly used. Capacitive load modulation is shown in Figure 27. In this

case, a capacitor is connected from COMM1 to AC1 and from COMM2 to AC2. When the COMM switches are

closed there is effectively a 22 nF capacitor connected between AC1 and AC2. Connecting a capacitor in

between AC1 and AC2 modulates the impedance seen by the coil, which will be reflected to the primary and

interpreted by the controller as a change in current.

Figure 27. Capacitive Load Modulation

Figure 28 shows how the COMM pins can be used for resistive load modulation. Each COMM pin can handle at

most a 24 Ωcommunication resistor. Therefore, if a COMM resistor between 12 Ωand 24 Ωis required, COMM1

and COMM2 pins must be connected in parallel. bq5105x does not support a COMM resistor less than 12 Ω.

Figure 28. Resistive Load Modulation

l TEXAS INSTRUMENTS

NTC

TS/CTRL

20 lQ

VTSB

NTC

TS/CTRL

20 lQ

VTSB

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

8.3.4.9 Adaptive Communication Limit

The Qi communication channel is established through backscatter modulation as described in the previous

sections. This type of modulation takes advantage of the loosely coupled inductor relationship between the RX

and TX coils. Essentially, the switching in-and-out of the communication capacitor or resistor adds a transient

load to the RX coil in order to modulate the TX coil voltage and current waveform (amplitude modulation). The

consequence of this technique is that a load transient (load current noise) from the mobile device has the same

signature. To provide noise immunity to the communication channel, the output load transients must be isolated

from the RX coil. The proprietary feature Adaptive Communication Limit achieves this by dynamically adjusting

the current limit of the regulator.

This can be seen in Figure 12. In this plot, an output load is limited to 400 mA during communications time. The

pulses on VRECT indicate that a communication packet event is occurring. The regulator limits the load to a

constant 400 mA and, therefore, preserves communication.

8.3.4.10 Synchronous Rectification

The bq5105x provides an integrated, self-driven synchronous rectifier that enables high-efficiency AC to DC

power conversion. The rectifier consists of an all NMOS H-Bridge driver where the back gates of the diodes are

configured to be the rectifier when the synchronous rectifier is disabled. During the initial start-up of the WPC

system the synchronous rectifier is not enabled. At this operating point, the DC rectifier voltage is provided by the

diode rectifier. Once VRECT is greater than VUVLO, half synchronous mode will be enabled until the load current

surpasses IBAT-SR. Above IBAT-SR the full synchronous rectifier stays enabled until the load current drops back

below the hysteresis level (IBAT-SRH) where half synchronous mode is re-enabled.

8.3.4.11 Internal Temperature Sense (TS Function of the TS/CTRL Pin)

The bq5105x includes a ratiometric battery temperature sense circuit. The temperature sense circuit has two

ratiometric thresholds which represent hot and cold conditions. An external temperature sensor is recommended

to provide safe operating conditions to the receiver product. This pin is best used when monitoring the battery

temperature.

The circuits in Figure 29 allow for any NTC resistor to be used with the given VHOT and VCOLD thresholds. The

thermister characteristics and threshold temperatures selected will determine which circuit is best for an

application.

Figure 29. NTC Circuit Options for Safe Operation of the Wireless Receiver Power Supply

l TEXAS INSTRUMENTS

( )

NTC o

TCOLD

NTC o

THOT

1 1

TCOLD To

1 1

THOT To

R R e

( )

3 NTC 1

THOT

3 NTC 1

THOT

HOT

3 NTC 1

THOT

3 NTC 1

THOT

R R R

%V 100

R R R

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ç ÷

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= ´

æ ö

ç ÷ +

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( )

3 NTC 1

TCOLD

3 NTC 1

TCOLD

COLD

3 NTC 1

TCOLD

3 NTC 1

TCOLD

R R R

%V 100

R R R

æ ö

ç ÷

è ø

= ´

æ ö

ç ÷ +

ç ÷

è ø

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

The resistors R1 and R3 can be solved by resolving the system of equations at the desired temperature

thresholds. The two equations are:

(3)

(4)

Where:

TCOLD and THOT are the desired temperature thresholds in degrees Kelvin. Rois the nominal resistance at T0

(25°C) and βis the temperature coefficient of the NTC resistor. For an example solution for part number ERT-

JZEG103JA see the BQ5105XB NTC Calculator Tool, (SLUS629).

Where,

TCOLD = 0°C (273.15°K)

THOT = 60°C (333.15°K)

β= 3380

Ro= 10 kΩ

The plot of the percent VTSB versus temperature is shown in Figure 30:

l TEXAS INSTRUMENTS Examp‘e Snlullun fuv Pan #ERT-JZEGMEJA 55 bu! mo 41> a Vtsh Percem (%) 1 ‘ ‘ 50 10 20 30 AD 50 60 Temperature (1:) 4.. 24m; #7 YSJIEAD m; m mg. m WW 240 m when mm was 5% TS pm Is NIrZ , I| s wmsdegg‘mjfmm mmame mm, m m dewce .5 mm me TS pm

240ms

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Figure 30. Example Solution for Panasonic Part # ERT-JZEG103JA

Figure 31 shows the periodic biasing scheme used for measuring the TS state. An internal TS_READ signal

enables the TS bias voltage for 25 ms. During this period the TS comparators are read (each comparator has a

10-ms deglitch) and appropriate action is taken based on the temperature measurement. After this 25-ms period

has elapsed the TS_READ signal goes low, which causes the TS/CTRL pin to become high impedance. During

the next 100-ms period, the TS voltage is monitored and compared to VCTRL-HI. If the TS voltage is greater than

VCTRL-HI then a secondary device is driving the TS/CTRL pin and a CTRL = 1 is detected.

Figure 31. Timing Diagram for TS Detection Circuit

8.3.4.11.1 TS/CTRL Function

The TS/CTRL pin offers three functions:

• NTC temperature monitoring

• Charge done indication

• Fault indication

When an NTC resistor is connected between the TS/CTRL pin and PGND, the NTC function is allowed to

operate. This functionality can effectively be disabled by connecting a 10 kΩresistor from TS/CRTL to PGND. If

the TS/CTRL pin is pulled above VCTRL-HI, the RX is shut down with the indication of a charge complete

condition. If the TS/CTRL pin is pulled below VCTRL-LOW, the RX is shut down with the indication of a fault.

l TEXAS INSTRUMENTS

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

8.3.4.11.2 Thermal Protection

The bq5105x includes thermal shutdown protection. If the die temperature reaches TJ-SD, the LDO is shut off to

prevent any further power dissipation. Once the temperature falls TJ-Hys below TJ-SD, operation can continue.

8.3.4.12 WPC v1.2 Compatibility

The bq5105x is a WPC v1.2 compatible device. In order to enable a Power Transmitter to monitor the power loss

across the interface as one of the possible methods to limit the temperature rise of Foreign Objects, the bq5105x

reports its Received Power to the Power Transmitter. The Received Power equals the power that is available

from the output of the Power Receiver plus any power that is lost in producing that output power. For example,

the power loss includes (but is not limited to) the power loss in the Secondary Coil and series resonant capacitor,

the power loss in the Shielding of the Power Receiver, the power loss in the rectifier, the power loss in any post-

regulation stage, and the eddy current loss in metal components or contacts within the Power Receiver. In the

WPC v1.2 specification, foreign object detection (FOD) is enforced, that means the bq5105x will send received

power information with known accuracy to the transmitter.

WPC v1.2 defines Received Power as “the average amount of power that the Power Receiver receives through

its Interface Surface, in the time window indicated in the Configuration Packet”.

A Receiver will be certified as WPC v1.2 only after meeting the following requirement. The device under test

(DUT) is tested on a Reference Transmitter whose transmitted power is calibrated, the receiver must send a

received power such that:

0 < (TX PWR) REF – (RX PWR out) DUT < 375 mW (5)

This 250 mW bias ensures that system will remain interoperable.

WPC v1.2 Transmitters will be tested to see if they can detect reference Foreign Objects with a Reference

receiver. The WPC v1.2 specification allows much more accurate sensing of Foreign Objects than WPC v1.0.

A Transmitter can be certified as a WPC v1.2 only after meeting the following requirement. A Transmitter is

tested to see if it can prevent some reference Foreign Objects (disc, coin, foil) from exceeding their threshold

temperature (60°C, 80°C).

8.4 Device Functional Modes

The general modes of battery charging are described above in the Feature Description. The bq5105x devices

have several functional modes. Start-up refers to the initial power transfer and communication between the

receiver (bq5105x circuit) and the transmitter. Power transfer refers to any time that the TX and RX are

communicating and power is being delivered from the TX to the RX. Charge termination covers intentional

termination (charge complete) and unintentional termination (removal of the RX from the TX, over temperature or

other fault conditions).

l TEXAS INSTRUMENTS

HOST

NTC PACK+

PACK-

bq5105xB

BAT

TERM

AD-EN

CHG

EN2

CBOOT1

CBOOT2

AC1

AC2

COMM2

CLAMP2

CCOMM2

CCLAMP2

COIL

BOOT1 RECT

TS/CTRL

BOOT2

CLAMP1

CCLAMP1

CCOMM1 COMM1

Bi-State

Tri-State

PGND

ILIM

RFOD

FOD

ROS

Wireless

Power

Transmitter

COIL

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The bq51050B is an integrated wireless power receiver and charger in a single device. The device complies with

the WPC v1.2 specifications for a wireless power receiver. When paired with a WPC v1.2 compliant transmitter, it

can provide up to 5-W of power for battery charging. There are several tools available for the design of the

system. These tools may be obtained by checking the product page at www.ti.com/product/bq51050b.

9.2 Typical Application

9.2.1 bq51050B Used as a Wireless Power Receiver and Li-Ion/Li-Pol Battery Charger

The following application discussion covers the requirements for setting up the bq51050B in a Qi-compliant

system for charging a battery.

Figure 32. Typical Application Schematic

9.2.1.1 Design Requirements

This application is for a 4.2-V Lithium-Ion battery to be charged at 800 mA. Because this is planned for a WPC

v1.2 solution, any of the Qi-certified transmitters can be used interchangeably so no discussion of the TX is

required. To charge a 4.20-V Li-Ion battery, the bq51050B will be chosen. Each of the components from the

application drawing will be examined. Temperature sensing of the battery must be done with JEITA

specifications. An LED indicator is required to notify the user if charging is active.

l TEXAS INSTRUMENTS C1(C)

2 D s

(2 s) L '

C ( 2 ) L C

=p´ ¦ ´

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(example) Secondary Coil Shielding (optional)

Primary Shielding

C2 (Cd)

>•[

C1 (Cs)

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Typical Application (continued)

9.2.1.2 Detailed Design Procedure

9.2.1.2.1 Series and Parallel Resonant Capacitor Selection

Shown in Figure 33, the capacitors C1 (series) and C2 (parallel) make up the dual resonant circuit with the

receiver coil. These two capacitors must be sized correctly per the WPC v1.2 specification. Figure 33 shows the

equivalent circuit of the dual resonant circuit:

Figure 33. Dual Resonant Circuit with the Receiver Coil

The power receiver design requirements in volume 1 of the WPC v1.2 specification highlights in detail the sizing

requirements. To summarize, the receiver designer will be required take inductance measurements with a fixed

test fixture. The test fixture is shown in Figure 34:

Figure 34. WPC v1.2 Receiver Coil Test Fixture for the Inductance Measurement Ls’

The primary shield is to be 50 mm × 50 mm × 1 mm of Ferrite material PC44 from TDK Corp. The gap (dZ) is to

be 3.4 mm. The receiver coil, as it will be placed in the final system (for example, the back cover and battery

must be included if the system calls for this), is to be placed on top of this surface and the inductance is to be

measured at 1-V RMS and a frequency of 100 kHz. This measurement is termed Ls’. The measurement termed

Ls is the free-space inductance. Each capacitor can then be calculated using Equation 6:

(6)

Where fSis 100 kHz +5/–10% and fDis 1 MHz ±10%. C1must be chosen first prior to calculating C2. The quality

factor must be greater than 77 and can be determined by Equation 7:

l TEXAS INSTRUMENTS Ls

2 Ls

p ´ ¦ ´

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Typical Application (continued)

(7)

Where R is the DC resistance of the receiver coil. All other constants are defined above.

For this application, we will design with an inductance measurement (L) of 11 µH and an Ls' of 16 µH with a DC

resistance of 191 mΩ. Plugging Ls' into Equation 6 above, we get a value for C1to be 158.3 nF. The range on

the capacitance is about 144 nF to 175 nF. To build the resulting value, the optimum solution is usually found

with 3 capacitors in parallel. This allows for more precise selection of values, lower effective resistance and

better thermal results. To get 158 nF, choose from standard values. In this case, the values are 68 nF, 47 nF and

39 nF for a total of 154 nF. Well in the required range. Now that C1is chosen, the value of C2can be calculated.

The result of this calculation is 2.3 nF. The practical solution for this is 2 capacitors, a 2.2 nF capacitor and a 100

pF capacitor. In all cases, these capacitors must have at least a 25-V rating. Solving for the quality factor (Q) this

solution shows a rating over 500.

9.2.1.2.2 COMM, CLAMP and BOOT Capacitors

For most applications, the COMM, CLAMP and BOOT capacitors will be chosen to match the Evaluation Module.

The BOOT capacitors are used to allow the internal rectifier FETs to turn on and off properly. These capacitors

are on the AC1 or AC2 lines to the Boot nodes and should have a minimum of 10-V rating. A 10-nF capacitor

with a 10-V rating is chosen.

The CLAMP capacitors are used to aid the clamping process to protect against overvoltage. Choosing a 0.47-µF

capacitor with a 25-V rating is appropriate for most applications.

The COMM capacitors are used to facilitate the communication from the RX to the TX. This selection can vary a

bit more than the BOOT and CLAMP capacitors. In general, a 22-nF capacitor is recommended. Based on the

results of testing of the communication robustness, a change to a 47-nF capacitor may be in order. The larger

the capacitor the larger the deviation will be on the coil which sends a stronger signal to the TX. This also

decreases the efficiency somewhat. In this case, choose the 22-nF capacitor with the 25-V rating.

9.2.1.2.3 Charging and Termination Current

The Design Requirements show an 800-mA charging current and an 80-mA termination current.

Setting the charge current (IBULK) is done by selecting the R1and RFOD. Solving Equation 1 results in RILIM of 393

Ω. Setting RFOD to 200 Ωas a starting point before the FOD calibration is recommended. This leaves 205 Ωfor

R1. Using standard resistor values (or resistors in series / parallel) can improve accuracy.

Setting the termination current is done with Equation 2. Because 80 mA is 10% of the IBULK (800mA), the RTERM

is calculated as (240 * 10) or 2.4 kΩ.

9.2.1.2.4 Adapter Enable

The AD pin will be tied to the external USB power source to allow for an external source to power the system.

AD_EN is tied to the gate of Q1 (CSD75205W1015). This allows the bq51050B to sense when power is applied

to the AD pin. The EN2 pin controls whether the wired source will be enabled or not. EN2 is tied to the system

host to allow it to control the use of the USB power. If wired power is enabled and present, the AD pin will

disable the BAT output and then enable Q1 through the AD_EN pin. An external charger is required to take

control of the battery charging.

9.2.1.2.5 Charge Indication and Power Capacitors

The CHG pin is open-drain. D1and R4are selected as a 2.1-V forward bias capable of 2 mA and a 100-Ω

current-limiting resistor.

RECT is used to smooth the internal AC to DC conversion. Two 10-µF capacitors and a 0.1-µF capacitor are

chosen. The rating is 25 V.

BAT capacitors are 1.0 µF and 0.1 µF.

l TEXAS INSTRUMENTS Tekmg —‘— mnymmeynw Teksm + . I‘w‘mummuu / W j WWW : : EW v . '1‘: ID Wax _ n m E Izax VWIIWVN .VﬂﬂVWMWVN' $200M 2005 MN Wﬂ ‘5an 2M} IN!” “32369

VRECT

VBAT

IBAT

VRECT

VBAT

IBAT

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

Typical Application (continued)

9.2.1.3 Application Curves

Figure 35. Battery Insertion During Precharge Figure 36. Precharge to Fast-Charge Transition

! TEXAS INSTRUMENTS 26/ «HI—

HOST

NTC PACK+

PACK-

bq5105xB

BAT

TERM

AD-EN

CHG

EN2

CBOOT1

CBOOT2

AC1

AC2

COMM2

CLAMP2

CCOMM2

CCLAMP2

COIL

BOOT1 RECT

TS/CTRL

BOOT2

CLAMP1

CCLAMP1

CCOMM1 COMM1

Bi-State

Tri-State

USB or

AC Adapter

Input C5

PGND

ILIM

RFOD

FOD

ROS

Wireless

Power

Transmitter

COIL

/PG NC

ISET

VSS

PRETERM ISET2

/CHG

OUT

bq24040

C6C7

CSD75207W15 R6

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

Typical Application (continued)

9.2.2 Application for Wired Charging

The application discussed below will cover the same requirements as the first example and will add a DC supply

with a secondary charger. This solution covers using a standard DC supply or a USB port as the supply.

Figure 37. bq51050B Wireless Power Receiver and Wired Charger

9.2.2.1 Design Requirements

The requirements for this solution are identical to the first application so all common components are identical.

This solution adds a wired charger and a blocking back-back FET (Q1).

The addition of a wired charger is simply enabled. The AD pin on the bq5105x is tied to the input of the DC

supply. When the bq5105x senses a voltage greater than VAD-Pres on the AD pin, the BAT pin will be disabled

(high impedance). Once the BAT pin is disabled, the AD_EN pin will transition and enable Q1. If wireless power

is not present, the functionality of AD and AD_EN remains and wired charging can take place.

9.2.2.2 Detailed Design Procedure

9.2.2.2.1 Blocking Back-Back FET

Q1 is recommended to eliminate the potential for both wired and wireless systems to drive current to the

simultaneously. The charge current and DC voltage level will set up parmerters for the blocking FET. The

requirements for this system are 1 A for the wired charger and 5 V DC. The CSD75207W15 is chosen for its low

RON and small size.

The wired charger in this solution is the bq24040. See the bq24040 datasheet (SLUS941) for specific component

selection.

*9 TEXAS INSTRUMENTS ° IolW

PGND

AC1

AC2

BAT

AC1-AC2 capacitors

AC1 Series capacitors

BOOT2

capacitor

BOOT1

capacitor

CLAMP2

capacitor

BAT capacitors

COMM1

capacitor

CLAMP2

capacitor

ILIM

EN2

TERM

/CHG

COMM1

BOOT1

BOOT2

COMM2

TS/CTRL

bq51050B

bq51051B

bq51052B

www.ti.com

SLUSB42F –JULY 2012–REVISED JUNE 2017

Product Folder Links: bq51050B bq51051B bq51052B

10 Power Supply Recommendations

The bq51050B requires a Qi-compatible transmitter as its power supply.

11 Layout

11.1 Layout Guidelines

• Keep the trace resistance as low as possible on AC1, AC2, and BAT.

• Detection and resonant capacitors need to be as close to the device as possible.

• COMM, CLAMP, and BOOT capacitors need to be placed as close to the device as possible.

• Via interconnect on PGND net is critical for appropriate signal integrity and proper thermal performance.

• High frequency bypass capacitors need to be placed close to RECT and OUT pins.

• ILIM and FOD resistors are important signal paths and the loops in those paths to PGND must be minimized.

• For the RHL package, connect the thermal pad to ground to help dissipate heat.

Signal and sensing traces are the most sensitive to noise; the sensing signal amplitudes are usually

measured in mV, which is comparable to the noise amplitude. Make sure that these traces are not being

interfered by the noisy and power traces. AC1, AC2, BOOT1, BOOT2, COMM1, and COMM2 are the main

source of noise in the board. These traces should be shielded from other components in the board. It is

usually preferred to have a ground copper area placed underneath these traces to provide additional

shielding. Also, make sure they do not interfere with the signal and sensing traces. The PCB should have a

ground plane (return) connected directly to the return of all components through vias (two vias per capacitor

for power-stage capacitors, one via per capacitor for small-signal components).

For a 1-A fast charge current application, the current rating for each net is as follows:

• AC1 = AC2 = 1.2 A

• OUT = 1 A

• RECT = 100 mA (RMS)

• COMMx = 300 mA

• CLAMPx = 500 mA

• All others can be rated for 10 mA or less

11.2 Layout Example

Figure 38. bq5105x Layout Example

l TEXAS INSTRUMENTS

bq51050B

bq51051B

bq51052B

SLUSB42F –JULY 2012–REVISED JUNE 2017

www.ti.com

Product Folder Links: bq51050B bq51051B bq51052B

12 Device and Documentation Support

12.1 Documentation Support

12.1.1 Related Documentation

For related documentation, see the following:

bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start,SLUS941

12.2 Related Links

The table below lists quick access links. Categories include technical documents, support and community

resources, tools and software, and quick access to sample or buy.

Table 2. Related Links

PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL

DOCUMENTS TOOLS &

SOFTWARE SUPPORT &

COMMUNITY

bq51050B Click here Click here Click here Click here Click here

bq51051B Click here Click here Click here Click here Click here

bq51052B Click here Click here Click here Click here Click here

12.3 Receiving Notification of Documentation Updates

To receive notification of documentation updates — go to the product folder for your device on ti.com. In the

upper right-hand corner, click the Alert me button to register and receive a weekly digest of product information

that has changed (if any). For change details, check the revision history of any revised document.

12.4 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective

contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of

Use.

TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration

among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help

solve problems with fellow engineers.

Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and

contact information for technical support.

12.5 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

12.6 Electrostatic Discharge Caution

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

12.7 Glossary

SLYZ022 —TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

13 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

I TEXAS INSTRUMENTS Samples Samples Samples Samples Samples Sample: Sample: Samples Samples Samples

PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead finish/

Ball material

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

BQ51050BRHLR ACTIVE VQFN RHL 20 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51050B

BQ51050BRHLT ACTIVE VQFN RHL 20 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51050B

BQ51050BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51050B

BQ51050BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51050B

BQ51051BRHLR ACTIVE VQFN RHL 20 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51051B

BQ51051BRHLT ACTIVE VQFN RHL 20 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR 0 to 125 BQ51051B

BQ51051BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51051B

BQ51051BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51051B

BQ51052BYFPR ACTIVE DSBGA YFP 28 3000 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51052B

BQ51052BYFPT ACTIVE DSBGA YFP 28 250 RoHS & Green SNAGCU Level-1-260C-UNLIM 0 to 125 BQ51052B

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

I TEXAS INSTRUMENTS

PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

Addendum-Page 2

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

I TEXAS INSTRUMENTS REEL DIMENSIONS TAPE DIMENSIONS ’ I‘KO '«Pt» Reel DlameIer A0 Dimension designed to accommodate the component Width Bo Dimension designed to accommodate the component Iength K0 Dimension designed to accommodate the component thickness 7 w Overau Wiotn onhe carrier Iape i P1 Pitch between successive cawty centers f T Reel Width (W1) QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE QOODOOOO ,,,,,,,,,,, ‘ User DIreCIIOn 0' Feed SprockeI Hoies Pockel Quadrams

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

BQ51050BRHLR VQFN RHL 20 3000 330.0 12.4 3.71 4.71 1.1 8.0 12.0 Q1

BQ51050BRHLT VQFN RHL 20 250 180.0 12.4 3.71 4.71 1.1 8.0 12.0 Q1

BQ51050BYFPR DSBGA YFP 28 3000 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

BQ51050BYFPT DSBGA YFP 28 250 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

BQ51051BRHLR VQFN RHL 20 3000 330.0 12.4 3.71 4.71 1.1 8.0 12.0 Q1

BQ51051BRHLT VQFN RHL 20 250 180.0 12.4 3.71 4.71 1.1 8.0 12.0 Q1

BQ51051BYFPR DSBGA YFP 28 3000 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

BQ51051BYFPT DSBGA YFP 28 250 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

BQ51052BYFPR DSBGA YFP 28 3000 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

BQ51052BYFPT DSBGA YFP 28 250 180.0 8.4 2.0 3.13 0.6 4.0 8.0 Q1

PACKAGE MATERIALS INFORMATION

www.ti.com 6-Apr-2017

Pack Materials-Page 1

I TEXAS INSTRUMENTS TAPE AND REEL BOX DIMENSIONS

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

BQ51050BRHLR VQFN RHL 20 3000 367.0 367.0 35.0

BQ51050BRHLT VQFN RHL 20 250 210.0 185.0 35.0

BQ51050BYFPR DSBGA YFP 28 3000 182.0 182.0 20.0

BQ51050BYFPT DSBGA YFP 28 250 182.0 182.0 20.0

BQ51051BRHLR VQFN RHL 20 3000 367.0 367.0 35.0

BQ51051BRHLT VQFN RHL 20 250 210.0 185.0 35.0

BQ51051BYFPR DSBGA YFP 28 3000 182.0 182.0 20.0

BQ51051BYFPT DSBGA YFP 28 250 182.0 182.0 20.0

BQ51052BYFPR DSBGA YFP 28 3000 182.0 182.0 20.0

BQ51052BYFPT DSBGA YFP 28 250 182.0 182.0 20.0

PACKAGE MATERIALS INFORMATION

www.ti.com 6-Apr-2017

Pack Materials-Page 2

GENERIC PACKAGE VIEW RHL 20 VQFN - 1 mm max heigm 3 5 X 4 5 mm o 5 mm pitch PLASTIC QUAD FLATPACKVNO LEAD . . , . Images above are jusl a represenlalion of the package family, aclual package may vary Refel lo the product dala sheel for package details. 4205346/L I TEXAS INSTRI IMFNTS

cccfccc Ami NOTES.

NOTES:

1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing

per ASME Y14.5M.

2. This drawing is subject to change without notice.

3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance.

PACKAGE OUTLINE

4219071 / A 05/2017

www.ti.com

VQFN - 1 mm max height

PLASTIC QUAD FLATPACK- NO LEAD

RHL0020A

0.08 C

0.1 C A B

0.05 C

SYMM

PIN 1 INDEX AREA

SEATING PLANE

PIN 1 ID

(OPTIONAL)

2.05±0.1

3.05±0.1

3.6

3.4

4.6

4.4

1 MAX

(0.2) TYP

2X (0.55)

3.5

14X 0.5

10 11

2X 1.5

4X (0.2)

20X 0.29

0.19

20X 0.5

0.3

T llk kl E ii

NOTES: (continued)

4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments

literature number SLUA271 (www.ti.com/lit/slua271) .

5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.

6. Vias are optional depending on application, refer to device data sheet. If any vias are implemented, refer to theri

locations shown on this view. It is recommended that vias under paste be filled, plugged or tented.

EXAMPLE BOARD LAYOUT

4219071 / A 05/2017

www.ti.com

VQFN - 1 mm max height

RHL0020A

PLASTIC QUAD FLATPACK- NO LEAD

SYMM

LAND PATTERN EXAMPLE

EXPOSED METAL SHOWN

SCALE: 18X

2X (1.5)

6X (0.525)

(0.775)

(4.3)

(3.3)

20X (0.6)

20X (0.24)

14X (0.5)

(3.05)

(2.05)

(R0.05) TYP

(Ø0.2) VIA

TYP)

10 11

0.07 MAX

ALL AROUND 0.07 MIN

ALL AROUND

SOLDER MASK DETAILS

NON SOLDER MASK

DEFINED

(PREFERRED)

SOLDER MASK

DEFINED

METAL

SOLDER MASK

OPENING

SOLDER MASK

OPENING

METAL UNDER

SOLDER MASK

2X (0.75)

2X (0.4)

SOLDER MASK

OPENING

METAL UNDER

SOLDER MASK

4X (0.2)

2X (0.55)

EXPOSED METAL EXPOSED METAL

NOTES: (continued)

7. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate

design recommendations..

EXAMPLE STENCIL DESIGN

4219071 / A 05/2017

www.ti.com

VQFN - 1 mm max height

RHL0020A

PLASTIC QUAD FLATPACK- NO LEAD

SYMM

SOLDER PASTE EXAMPLE

BASED ON 0.1mm THICK STENCIL

EXPOSED PAD

75% PRINTED COVERAGE BY AREA

SCALE: 20X

(4.3)

2X (1.5)

(3.3)

(1.05)

TYP

6X (0.92)

(0.85)

14X (0.5)

20X (0.24)

20X (0.6)

(0.56)

TYP

METAL

TYP

4X (0.2)

2X (0.25)

(0.55)

TYP

SOLDER MASK EDGE

TYP

(0.775)

10 11

(R0.05) TYP

MECHANICAL DATA YFP (RiXBGAiNZS) DIE*S\ZE BALL CR‘D ARRAY e®o@@ F0000 [0000 [E o n<><><343 *="" c000®="" ,="" 0,40="" w="" 80000="" a="" o="" o="" o="" q="" \="" 1="" 2="" 3="" 4="" bali="" ai="" index="" area="" eutmm="" wew="" 28x="" ¢%="" i_iie|="" 0,5+max="" $="" q="" 0'05="" c="" j_u="" u="" u="" u7"="" seating="" piane="" m="" i="" 0.13="" 420698641/t="" 05/13="" notes:="" a,="" an="" linear="" dimensions="" are="" in="" miiiimeters.="" dimensianing="" and="" ioierancing="" per="" asme="" wismiesi.="" b.="" this="" drawing="" is="" subject="" to="" change="" without="" notice,="" 0.="" nannfreew="" package="" conﬁguration.="" nanofree="" is="" a="" trademivk="" oi="" texas="" instmmants="" {i}="" texas="" instruments="" www.1i.com="">

D: Max =

E: Max =

3.036 mm, Min =

1.913 mm, Min =

2.976 mm

1.852 mm

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TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE

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IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD

PARTY INTELLECTUAL PROPERTY RIGHTS.

These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate

TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable

standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you

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Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

BQ5105xB Datasheet by Texas Instruments

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