MAX1889 Eval Kit Datasheet

lVI/JXI/VI [VI/JXIIVI
General Description
The MAX1889 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that contains a
step-up switching regulator, a positive three-stage
charge-pump and high-voltage positive linear-regulator
controller, and a negative three-stage charge-pump
and high-voltage negative linear-regulator controller.
The step-up switching circuit is configured for a 9V out-
put and provides up to 200mA from a DC supply volt-
age of 2.7V to 5.5V.
The positive charge-pump and linear regulator are config-
ured for a 20V output using two charge-pump stages pro-
viding up to 10mA. The negative charge pump and linear
regulator are configured for a -7V output using a single
charge-pump stage providing up to 10mA. Power for the
positive charge-pump input can be provided by the DC
input source or the step-up switching regulator output.
Power for the negative charge-pump input can be provid-
ed by the DC input source or the power ground.
The MAX1889 EV kit demonstrates low quiescent cur-
rent and high efficiency (up to 90%) for maximum bat-
tery life. The EV kit features overload protection for the
input and all outputs. Operation at 1MHz allows the use
of tiny surface-mount components. The MAX1889 QFN
package (1.0mm max) with low-profile external compo-
nents allows this circuit to be 1.25mm high.
Features
♦2.7V to 5.5V Input Range
♦Output Voltages
9V Output at 200mA (Step-Up Switching)
20V Output >10mA (Positive Charge-Pump
Regulator)
-7V Output >10mA (Negative Charge-Pump
Regulator)
♦Resistor-Adjustable Outputs
♦Up to Three Positive and Three Negative Charge-
Pump Stages
♦Up to +28V and -22V Linear-Regulated Output
(As Configured)
♦90% Efficiency
♦500kHz/1MHz Step-Up Switching Frequency
♦Overcurrent Protection
♦Low Profile
♦Surface-Mount Components
♦Fully Assembled and Tested
Evaluates: MAX1889
MAX1889 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-2518; Rev 2; 9/02
Component List
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TEMP RANGE IC PACKAGE
MAX1889EVKIT 0°C to +70°C 16 QFN 5mm x 5mm
DESIGNATION QTY DESCRIPTION
C1 1
0.47µF ±10%, 16V X7R
ceramic capacitor (0805)
Taiyo Yuden EMK212BJ474KD
C2, C3 2
3.3µF ±20%, 6.3V X5R
ceramic capacitors (0805)
Taiyo Yuden JMK212BJ335MG
C4, C5, C6 3
4.7µF ±20%, 10V X7R
ceramic capacitors (1210)
Taiyo Yuden LMK325BJ475MF
C7 1
0.01µF ±10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H103K
DESIGNATION QTY DESCRIPTION
C8 1
220pF ±10%, 50V COG
ceramic capacitor (0603)
TDK C1608COG1H221K
C9 1
0.22µF ±10%, 10V X7R
ceramic capacitor (0603)
Taiyo Yuden LMK107BJ224KA
C10–C14, C17,
C18, C19,
C21, C22
10
0.1µF ±10%, 50V X7R
ceramic capacitors (0805)
Taiyo Yuden UMK212BJ104KG
C15, C20 2
0.15µF ±10%, 50V X7R
ceramic capacitors (1206)
Taiyo Yuden UMK316BJ154KF
[MAXI/VI
Evaluates: MAX1889
MAX1889 Evaluation Kit
2 _______________________________________________________________________________________
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
Coilcraft 847-639-6400 847-639-1469 www.coilcraft.com
Fairchild 408-822-2000 408-822-2102 www.fairchildsemi.com
Sanyo 619-661-6322 619-661-1055 www.sanyovideo.com
Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com
TDK 847-803-6100 847-390-4405 www.component.tdk.com
Toshiba 949-455-2000 949-859-3963 www.toshiba.com/taec
Note: Please indicate that you are using the MAX1889 when contacting these component suppliers.
DESIGNATION QTY DESCRIPTION
C16, C23 2
1µF ±10%, 25V X7R
ceramic capacitors (0805)
TDK C2012X7R1E105K
C24, C26, C28 3
1000pF ±10%, 50V X7R
ceramic capacitors (0603)
TDK C1608X7R1H102K
C25 1
100µF ±20%, 16V aluminum
electrolytic capacitor (6.3mm x 5mm)
Sanyo 16MV100UAX
C27 1
2200pF ±10%, 50V X7R
ceramic capacitor (0603)
TDK C1608X7R1H222K
C29 1
470pF ±10%, 50V X7R
ceramic capacitor (0603)
TDK C1608X7R1H471K
C30 1
100pF ±10%, 50V COG
ceramic capacitor (0603)
TDK C1608COG1H101K
D1 1 1.0A, 30V Schottky diode (S-flat)
Toshiba CRS02
D2–D7 6 200mA 25V Schottky diodes (SOT23)
Fairchild BAT54S
D8 1 200mA 75V diode (SOT23)
Fairchild MMBD4148
JU1, JU2 2 2-pin headers
JU3, JU8 2 3-pin headers
JU4–JU7 4 4-pin headers
L1 1 4.7µH, 1.6A inductor
Coilcraft Inc. LPO2506IB-472
DESIGNATION QTY DESCRIPTION
P1 1
2.4A, -20V P-channel MOSFET
(3-pin SuperSOT)
Fairchild FDN304P
P2 0 Not installed MOSFET (µ8)
Q1 1
200mA, 40V NPN bipolar transistor
(SOT23)
Fairchild MMBT3904
Q2 1
200mA, 40V PNP bipolar transistor
(SOT23)
Fairchild MMBT3906
R1 1 51.1kΩ ±1% resistor (0805)
R2, R10, R20 3 150kΩ ±1% resistors (0805)
R3, R4, R7 3 1MΩ ±5% resistors (0805)
R5 1 76.8kΩ ±1% resistor (0805)
R6 1 12.1kΩ ±1% resistor (0805)
R8 1 10kΩ ±5% resistor (0805)
R9, R12 2 3kΩ ±5% resistors (0805)
R11 1 24.3kΩ ±1% resistor (0805)
R13 1 301kΩ ±1% resistor (0805)
R14, R18 2 20kΩ ±1% resistors (0805)
R15 1 10Ω ±5% resistor (0805)
R16 1 220kΩ ±5% resistor (0805)
R17 1 15kΩ ±5% resistor (0805)
R19 1 43.2kΩ ±1% resistor (0805)
R21 1 Not installed resistor (0603)
U1 1 MAX1889EGE
(16-pin QFN 5mm x 5mm)
None 8 Shunts (JU1–JU8)
None 1 MAX1889 PC board
None 1 MAX1889 data sheet
None 1 MAX1889 EV kit data sheet
Component List (continued)
MAXWSBB data sh [MAXI/VI
Quick Start
Recommended Equipment
•2.7V to 5.5V, 2A DC power supply
•One voltmeter
Procedure
The MAX1889 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed:
1) Verify that there are no shunts across jumpers
JU1 (SHDN), JU2 (FREQ), JU3, JU4, and JU8.
2) Verify that a shunt is across pins 1 and 2 of JU7.
3) Verify that a shunt is across pins 1 and 3 of JU6.
4) Verify that a shunt is across pins 1 and 4 of JU5.
5) Connect the positive terminal of the input power
supply to the PIN pad. Connect the negative termi-
nal of the input power supply to the PGND pad.
6) Turn on the power supply and verify that the step-
up regulator output (VBST) is 9V.
7) Verify that the positive linear-regulator output (VPL)
is 20V.
8) Verify that the negative linear-regulator output (VNL)
is -7V.
For instructions on selecting the feedback resistors for
other output voltages, see the Output Voltage Selection
section.
Detailed Description
The MAX1889 EV kit contains a step-up switching regu-
lator and two linear-regulator controllers. It operates
from a DC power supply between 2.7V and 5.5V. The
switching frequency is selectable between 500kHz and
1MHz. The input and outputs of the EV kit are protected
against overload. The EV kit features a shutdown mode
for maximum battery life.
As configured, the step-up switching regulator generates
a 9V output and can provide at least 200mA of current to
the output. The step-up switching-regulator output volt-
age can be adjusted from the input voltage up to 13V
with resistors (see the Output Voltage Selection section).
As configured, the positive charge pump uses two of the
three charge-pump stages to generate approximately
24V and can provide greater than 10mA. The output is
post-regulated to 20V using a linear-regulator controller
and an external bipolar pass transistor. The positive linear
regulator’s output can be adjusted between 1.25V and
28V or, with additional circuitry, to even higher voltages
(refer to the Linear-Regulator Controllers section in the
MAX1889 data sheet).
As configured, the negative charge pump uses one of
the three charge-pump stages to generate approxi-
mately -7.6V and can provide greater than 10mA. The
output is post-regulated to -7V using a linear-regulator
controller and an external bipolar pass transistor. The
negative linear regulator’s output can be adjusted
between 0 and -22V or, with additional circuitry, to even
lower voltages (refer to the Linear-Regulator Controllers
section in the MAX1889 data sheet).
The EV kit includes input-current overload protection
that shuts down the circuit if the input current exceeds
a threshold for longer than 64ms. The threshold is set
by resistor-divider R1, R2, R19, R20, and the RDS(ON)
of MOSFET P1 or P2. Refer to the Setting the Input
Overcurrent Threshold section in the MAX1889 data
sheet for further details. The EV kit also includes output
overload protection that shuts down the circuit if any of
the output voltages drop below approximately 80% of
their nominal value for longer than 64ms.
Jumper Selection
Shutdown Mode
The MAX1889 EV kit features a shutdown mode that
reduces the MAX1889 quiescent current to less than
1µA. The 2-pin jumper, JU1, selects the shutdown
mode for the MAX1889 EV kit. Table 1 lists the selec-
table jumper options.
Caution: Do not connect an external controller to
the SHDN pad while a shunt is on JU1 since the
external controller can be damaged.
Frequency Mode
The MAX1889 EV kit features an option to choose the
switching frequency. JU2 selects the frequency mode for
the MAX1889 EV kit. Table 2 lists the selectable jumper
options. The EV kit is configured for 1MHz operation.
Optimum performance at 500kHz requires a larger induc-
tor value (refer to the Inductor Selection section in the
MAX1889 data sheet.)
Positive Charge Pump
The positive charge pump of the MAX1889 EV kit features
an option to cascade up to three stages of charge
pumps. Each stage of the charge pump can be powered
from INPUT, VBST, or the previous stage. JU8, JU7, and
JU6 configure the number of stages and select the
voltage source for the positive charge pump on the
MAX1889 EV kit. Tables 3, 4, and 5 list the jumper
options. The default configuration of the positive charge
pump of the MAX1889 EV kit is a two-stage charge pump
powered from VBST as indicated in Tables 4 and 5. Refer
to the Charge Pumps section of the MAX1889 data sheet
for information on selecting a charge-pump configuration.
Evaluates: MAX1889
MAX1889 Evaluation Kit
_______________________________________________________________________________________ 3
[MAXI/VI
Evaluates: MAX1889
Negative Charge Pump
The negative charge pump of the MAX1889 EV kit fea-
tures an option to cascade up to three stages of charge
pumps. Each stage of the charge pump can be pow-
ered from INPUT, PGND, or the previous stage. JU3,
JU4, and JU5 configure the number of stages and
select the voltage source for the negative charge pump
on the MAX1889 EV kit. Tables 6, 7, and 8 list the
jumper options. The default configuration of the nega-
tive charge pump of the MAX1889 EV kit is a one-stage
charge pump powered from PGND as indicated in
Table 8. Refer to the Charge Pumps section of the
MAX1889 data sheet for information on selecting a
charge-pump configuration.
Output Voltage Selection
Step-Up Switching-Regulator
Output Voltage
The MAX1889 EV kit’s step-up switching-regulator out-
put is set to 9V by feedback resistors R5 and R6. To
generate output voltages other than 9V (up to 13V),
select different external voltage-divider resistors (R5,
R6). The output capacitors (C4, C5, and C6) are rated
to 10V. To set the output voltage greater than 10V, use
higher-voltage rated capacitors. Refer to the Main Step-
Up Regulator, Output Voltage Selection section in the
MAX1889 data sheet for instructions on selecting the
resistors.
MAX1889 Evaluation Kit
4 _______________________________________________________________________________________
SHUNT
LOCATION
SECOND STAGE
POSITIVE CHARGE
PUMP
OPERATING
MODE
1-2
(Default) Connected to VBST
First stage of a two-
stage charge pump
powered by VBST
1-3 Connected to previous
stage charge-pump
output
Second stage of a
three-stage charge
pump
1-4 Connected to INPUT
First stage of a two-
stage charge pump
powered by INPUT
None Not used Not used for one-stage
charge pumps
Table 4. JU7 Functions
SHUNT
LOCATION
FIRST STAGE
POSITIVE CHARGE
PUMP
OPERATING MODE
1-2 Connected to VBST
First stage of a three-
stage charge pump
powered by VBST
2-3 Connected to INPUT
First stage of a three-
stage charge pump
powered by INPUT
None Not used
Not used for one-stage
or two-stage charge
pumps
Table 3. JU8 Functions
SHUNT
LOCATION SHDN PIN MAX1889 EV KIT OUTPUT
Installed Connected
to PGND Shutdown mode
None Connected to IN
through R3 MAX1889 enabled
None
External controller
connected
to SHDN pad
Logic high (IN) = enabled,
logic low (PGND) = disabled
Table 1. JU1 Functions Table 2. JU2 Functions
SHUNT
LOCATION FREQ PIN MAX1889 EV KIT
FREQUENCY
Installed Connected
to PGND Frequency = 500KHz
None Connected to
IN through R4 Frequency = 1MHz
[VI/JXIIVI
Positive Linear-Regulator
Output Voltage
The MAX1889 EV kit’s positive linear-regulator output is
set to 20V by feedback resistors R13 and R14. To gen-
erate output voltages other than 20V (1.25V to 28V),
select different external voltage-divider resistors (R13,
R14). Refer to the Linear-Regulator Controllers, Output
Voltage Selection section in the MAX1889 data sheet
for instructions on selecting the resistors.
Negative Linear-Regulator
Output Voltage
The MAX1889 EV kit’s negative linear-regulator output
is set to -7V by feedback resistors R10 and R11. To
generate output voltages other than -7V (0 to -22V),
select different external voltage-divider resistors (R10,
R11). Refer to the Linear-Regulator Controllers, Output
Voltage Selection section in the MAX1889 data sheet
for instructions on selecting the resistors.
Evaluates: MAX1889
MAX1889 Evaluation Kit
_______________________________________________________________________________________ 5
SHUNT
LOCATION
THIRD STAGE
POSITIVE CHARGE
PUMP
OPERATING
MODE
1-2 Connected to VBST
One-stage charge
pump powered by
VBST
1-3
(Default)
Connected to
previous stage
charge-pump output
Last stage of a
two-stage or
three-stage
charge pump
1-4 Connected to INPUT
One-stage charge
pump powered by
INPUT
Table 5. JU6 Functions
SHUNT
LOCATION
FIRST STAGE
NEGATIVE CHARGE
PUMP
OPERATING
MODE
1-2 Connected to INPUT
First stage of a three-
stage charge pump
powered by INPUT
2-3 Connected to PGND
First stage of a three-
stage charge pump
powered by PGND
None Not used
Not used for one-
stage or two-stage
charge pump
Table 6. JU3 Functions
SHUNT
LOCATION
SECOND STAGE
NEGATIVE CHARGE
PUMP
OPERATING
MODE
1-2 Connected to INPUT
First stage of a two-
stage charge pump
powered by INPUT
1-3
Connected to
previous stage
charge-pump output
Second stage of a three-
stage charge pump
1-4 Connected to PGND
First stage of a two-
stage charge pump
powered by PGND
None Not used Not used for one-stage
charge pump
Table 7. JU4 Functions
SHUNT
LOCATION
THIRD STAGE
NEGATIVE CHARGE
PUMP
OPERATING
MODE
1-2 Connected to INPUT One-stage charge pump
powered by INPUT
1-3 Connected to
previous stage
charge-pump output
Last stage of a two-
stage or three-stage
charge pump
1-4
(Default) Connected to PGND One-stage charge pump
powered by PGND
Table 8. JU5 Functions
ll/IAXIM [VIIJXIIVI
Evaluates: MAX1889
MAX1889 Evaluation Kit
6 _______________________________________________________________________________________
R1
51.1kΩ
1%
FBN
6
FBN FBP
MAX1889
U1
DRVPDRVN
7
DRVN
JU2
FREQ
IN
OCP
GATE
10
9FBP
8DRVP
PGND 2
GND 3
4
JU1
R4
1MΩ
C1
0.47µF
R15
10Ω
C25
100µF
16V
R3
1MΩ
R2
150kΩ
1%
C3
3.3µF
6.3V
C24
1000pF
C2
3.3µF
6.3V
R6
12.1kΩ
1%
R8
10kΩ
R7
1MΩ
C7
0.01µF
R5
76.8kΩ
1%
C6
4.7µF
10V
C5
4.7µF
10V
C4
4.7µF
10V
SHDN
1
16
14
151
3
7
6
58
4
13
2
2
SHDN
PIN
PGND
REF
VREF
VBST
L1
4.7µH
P1
P2
TPA
FB
LX
D1
OCN
12
5
11
13 PGND
LX
PGND
INPUT R19
43.2kΩ
1%
C30
100pF
R20
150kΩ
1%
C8
220pF
C9
0.22µF
1
3D8
R21
OPEN
Figure 1. MAX1889 EV Kit Schematic (Sheet 1 of 2)
lVI/JXIIVI
Evaluates: MAX1889
MAX1889 Evaluation Kit
_______________________________________________________________________________________ 7
LX
D23
222
2
2
1
1
3
3
4
RL
C10
0.1µF
C13
0.1µF
INPUT
INPUT
VN
FBN
DRVN
JU3
JU4
D33
2
2
1
1
1
1
3
3
4
RL
C11
0.1µF
C14
0.1µF
Q1
JU5
D43
1
RL
C12
0.1µF
C15
0.15µF
R10
150kΩ
1%
R9
3kΩ
VNL
VREF
VBST
R11
24.3kΩ
1%
R16
220kΩ
C16
1µF
PGND
D73
22 2
2
3
1
1
RL
C19
0.1µF
C22
0.1µF
INPUT
INPUT
VBST
VBST
VBST
VP
FBP
DRVP
JU8
D63
2
2
1
1
1
3
3
4
RL
C18
0.1µF
C21
0.1µF
Q2
JU6
2
1
3
4
JU7
INPUT
D53
1
RL
C17
0.1µF
C20
0.15µF
C28
1000pF
R13
301kΩ
1%
R12
3kΩ
VPL
R14
20kΩ
1%
C23
1µFPGND
INPUT
C29
470pF
R18
20kΩ
1%
C27
2200pF
C26
1000pF
R17
15kΩ
Figure 1. MAX1889 EV Kit Schematic (Sheet 2 of 2)
Q xvulxum 0 O O Hmmm m uwmu umaas {mumun ml Wm m. MAM m m: us: ‘2: MAXI/III
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX1889
MAX1889 Evaluation Kit
Figure 2. MAX1889 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1889 EV Kit Component Placement Guide—
Solder Side
Figure 4. MAX1889 EV Kit PC Board Layout—Component Side Figure 5. MAX1889 EV Kit PC Board Layout—Solder Side