Analog Devices Inc. 的 I2C Battery Gas Gauges 规格书

CHARGER _——> T Measure Charge, Voltage and Temperat [302941 I LTCZMZI LT ILT‘ LTUHNEQB
For applications requiring accurate battery gas gauging, the LTC
®
2941 and LTC2942 coulomb counters provide tiny and
easy-to-use solutions. The LTC2941/LTC2942 use a continuous-time analog integrator, resulting in minimal offset and gain error
and better overall charge accuracy. The bidirectional analog integrator accommodates both battery charge and discharge, and
a programmable prescaler allows for a wide range of battery capacities. The LTC2942 incorporates a 14-bit ∆∑ ADC to measure
battery voltage and die temperature. The LTC2941-1 and LTC2942-1 also integrate a 50mΩ sense resistor to provide up to ±1A
measurement range. Charge, voltage* and temperature* are all communicated to the host system over an I2C/SMBus
compatible interface.
Features
n
Indicates Accumulated Battery Charge and Discharge
n
SMBus/I2C Interface
n
14-Bit ADC Measures Battery Voltage and Temperature
(*LTC2942)
n
High Side Current Sense with ±50mV Sense Range
n
Integrated 50mΩ High Side Sense Resistor with ±1A
Range (LTC2941-1/LTC2942-1)
n
1% Voltage and Charge Accuracy
n
±50mV Sense Voltage Range
n
Programmable High/Low Thresholds for All Measured
Parameters
n
Configurable Alert Output/Charge Complete Input
n
Quiescent Current <100µA
Measure Charge, Voltage and Temperature
I2C Battery Gas Gauges
LTC2941/
LTC2941-1
LTC2942/
LTC2942-1
Operating Voltage Range 2.7V to 5.5V 2.7V to 5.5V
Voltage and Temperature
Measurement
No Yes
Integrated Sense Resistor No/Yes No/Yes
Package 2mm × 3mm
DFN-6
2mm × 3mm
DFN-6
Linear Technology I2C Battery Gas Gauges
Part Sense Resistor TCE
LTC2942-1 N/A 2.8%
LTC2942 ±1%, 100ppm/°C ($0.10) 5.1%
±0.1%, 50ppm/°C ($0.30) 3.9%
±0.1%, 15ppm/°C ($3.75) 3.6%
Total Charge Error (TCE) Over Temperature
LOAD
+
–
CHARGER
REGISTER
HOST
LTC2942-1
I2C
L, LT, LTC, LTM, Linear Technology and the Linear logo
are registered trademarks and PowerPath and Bat-Track
are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Maximum \I'Iumbar Powm mm; .nd IFEEAIma: www.linsar.cD"|/2942 LTUDEAP
Power Manager Products for Li-Ion Batteries
The LTC2941/LTC2942 battery gas gauges
are ideal companions to Linear Technology’s
extensive family of single-cell Li-Ion battery
chargers and USB power managers. Pairing
with the LTC4099 I2C controlled USB power
manager/charger provides a powerful
combination that enables I2C programmability of
charge functions and complete I2C monitoring of
battery state-of-charge information.
The LTC4099’s switchmode topology features
PowerPath™ control, which seamlessly manages
power flow between a wall adapter or USB port
and the device’s Li-Ion/Polymer battery, while
preferentially providing power to the system
load. This revolutionary input current-limited
switching regulator design allows higher charge
current than conventional linear approaches,
while meeting USB specifications.
Part
Number
Maximum
Charge
Current (A)
Power
Manager
Topology Input Voltage (V)
Optional
External Ideal
Diode Controller Package Comments and Features
LTC4055/
LTC4055-1
1 Linear 4.3 to 5.5 No 4mm × 4mm
QFN-16
Bat-Track™, LTC4055-1 Has 4.1V VFLOAT
LTC4160/
LTC4160-1
1.2 Switching 4.35 to 5.5 Yes 3mm × 4mm
QFN-20
Bidirectional Switcher Generates 5V at 0.5A for USB
On-the-Go Applications, 6.1V OVP, Bat-Track, Instant-On
Operation, LTC4160-1 Has 4.1V VFLOAT
LTC4089 1.2 Linear 4.35 to 5.5 USB,
6 to 36 Wall (40V Max)
Yes 3mm × 6mm
DFN-22
Bat-Track, Instant-On Operation
LTC4089-1/
LTC4089-5
1.2 Linear 4.35 to 5.5 USB,
6 to 36 Wall (40V Max)
Yes 3mm × 6mm
DFN-22
Instant-On Operation, LTC4089-1 Has Bat-Track and for
4.1V Li-Ion, LTC4089-5 Has 5V Output and for 4.2V Li-Ion
LTC4067 1.25 Linear 4.35 to 5.5 Yes 3mm × 4mm
DFN-14
13V OVP
LTC4088/
LTC4088-1/
LTC4088-2
1.5 Switching 4.25 to 5.5 Yes, 30mΩ3mm × 4mm
DFN-14
Bat-Track, charge current reduces to maintain 3.6V
output at load. LTC4088 has 3.3V LDO while LTC4088-1
and LTC4088-2 do not. Power-up charger state is off for
LTC4088-1 and on for LTC4088-2.
LTC4098/
LTC4098-1
1.5 Switching 4.35 to 5.5 USB, Up to
38V Wall (60V Abs Max)
Yes, 30mΩ3mm × 4mm
QFN-20
66V OVP, Bat-Track, Instant-On Operation,
LTC4098-1 Has 4.1V VFLOAT
LTC4099 1.5 Switching 4.35 to 5.5 USB, Up to
38V Wall (60V Abs Max)
Yes, 30mΩ3mm × 4mm
QFN-20
I2C Control, Overtemperature Battery Conditioning Circuit,
66V OVP, Bat-Track, Instant-On Operation
LTC4090/
LTC4090-5
1.5 Linear 4.35 to 5.5 USB,
6 to 36 Wall (60V Max)
Yes 3mm × 6mm
DFN-22
Bat-Track, Instant-On Operation,
LTC4090-5 Has 5V Output and No Bat-Track
LTC4066/
LTC4066-1
1.5 Linear 4.3 to 5.5 No 4mm × 4mm
QFN-24
LTC4066-1 Has 4.1V VFLOAT
LTC4085/
LTC4085-1/
LTC4085-3
1.5 Linear 4.35 to 5.5 Yes, 50mΩ3mm × 4mm
DFN-14
LTC4085-1 Has 4.1V VFLOAT, LTC4085-3 Has 3.95V VFLOAT
LTC4155 3.5 Switching 4.35 to 5.5 USB,
77V OVP
Yes ‡4mm × 5mm
QFN-28
I2C Control, USB OTG, VFLOAT = 4.05V/4.1V/4.15V/4.2V
LTC4156 ˆ†3.5 Switching 4.35 to 5.5 USB,
77V OVP
Yes ‡4mm × 5mm
QFN-28
I2C Control, USB OTG, VFLOAT = 3.45V/3.55V/3.6V/3.8V
for Lithium Iron Phosphate
ˆ Future product, contact factory for details.
† LiFePO4 compatible.
‡ Required external PFET serves as ideal diode.
USB Power Managers for 1-Cell Li-Ion/Polymer Batteries
LTC2942-1
AL/CC
SDA
SCL
GND
SENSE+SENSE–
0.1µF
1 CELL
Li-Ion
LOAD
3.3V
3.3µH
2k2k
22µF
2k
3.01k
USB
10µF
0.1µF
LTC4099
VOUT
DVCC
VBUS
CLPROG
IDGATE
BAT
SW
IRQ
NTCGNDPROG
SDA
SCL
µP
VDD
1111B
www.linear.com/2942 n 1-800-4-LINEAR