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MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Control of Lithium Ion Batteries Charging
Monolithic IC MM1332
Outline
This IC is a high precision constant voltage constant current power source controller for lithium ion batteries
serving as power drivers for P-MOS FET. It was developed for use with one to three cell chargers, and the
constant current value can be set freely with external resistance. It has a built-in amplifier for detecting low
battery voltage. Using this IC enables the easy addition of a lithium ion battery charging function to
conventional battery-charging devices.
Features
1. Output voltage (Ta=-20°C+~70°C) 3Cell : 12.3V/12.6V±150mV
2Cell : 8.2V/8.4V±100mV
1Cell : 4.1V/4.2V±50mV
2. Current consumption 250µA typ.
3. Constant current output set by external resistance
Current limit (reference voltage) 0.1V=external resistance current value
4. Low voltage detection function (LV) 2.0V/cell
Package
SOP-8C, SOP-8E (MM1332 F)
*
The box represents the output (charging) voltage rank.
Applications
1. For charging lithium ion batteries
2. High-precision
Stable power sources for all types of equipment
Absolute Maximum Ratings
(Ta=25°C)
Item Symbol Rating Units
Storage temperature T
STG
-
40~+125 °C
Operating temperature T
OPR
-
20~+70 °C
Power supply voltage V
CC max.
-
0.3~+18 V
Output voltage V
O max.
-
0.3~VCC V
SW input voltage V
SW
-
0.3~VCC+0.3 V
Allowable power dissipation Pd 300 mW
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MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Electrical Characteristics
(Unless otherwise specified Ta=25°C, VCC=5V/CEL)
Item Symbol Measurement Conditions Min Typ. Max. Units
Operating power supply
V
CC 5.0 17.0 V
voltage range
Current consumption 1 I
CC1 VSW1=VSW2=OV (Charge : ON) 250 µA
Current consumption 2 I
CC2 VSW1=VSW2=VCC (Charge : OFF) 2 µA
Output voltage V
O
Ta=-20~+70°C, MM1332A, B, C 4.05 4.10 4.15
V/sell
Ta=-20~+70°C, MM1332D, E, F 4.15 4.20 4.25
Current limits V
CL 90 100 110 mV
CEL-CS resistance R
CEL
MM1332A, B, C 820
kΩ/sell
MM1332D, E, F 840
SW1 input current I
SW120µA
V
L1 Charge : ON
-
0.3 2.0 V
SW1 input voltage
V
H1 Charge : OFF
VCC VCC
V
-
1.0 +0.3
Low-voltage detection voltage
LV
A~F Rank 1.90 2.00 2.10
G Rank 2.00 2.15 2.30
V/sell
SW2 input current ISW220µA
V
L2 Low-voltage detection circuit : ON
-
0.3 2.0 V
SW2 input voltage
V
H2 Low-voltage detection circuit : OFF
VCC VCC
V
-
1.0 +0.3
Low voltage detection
I
LV 0.2 µA
output leak current
Low voltage detection
V
LV ISINK=1mA 0.2 0.4 V
output saturation voltage
*
: MM1332 A : Output voltage 4.1V -for 1cell
B : Output voltage 8.2V
-
for 2cell
C : Output voltage 12.3V
-
for 3cell
D : Output voltage 4.2V
-
for 1cell
E : Output voltage 4.4V
-
for 2cell
F : Output voltage 12.6V
-
for 3cell
G : Output voltage available
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MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Pin Assignment Description
1432
8567
SOP-8C/SOP-8E
Pin No. Name I/O Description
1 SW1 Input
2 SW2 Input
3 LV Output
4 GND
5 CS Input
6 CEL Input
7 EXT Output
8 V
CC
Charging ON/OFF control input pin.
SW1=V
CC : OFF, SW1=GND : ON
Goes OFF when open as it is pulled up to V
CC.
Low voltage detection circuit ON/OFF control input pin.
SW2=V
CC : OFF, SW2=GND : ON
Goes OFF when open as it is pulled up to V
CC.
Low voltage detection circuit output pin.
NPN-Tr open collector output; goes ON (low level) for low voltage.
Ground pin.
Current detection pin. Detects current when external resistor voltage drops and
controls current. Reference voltage 0.1V=external resistance current value
Battery voltage input pin
*
Six types depending on rank : 4.1V, 8.2V, 12.3V, 4.2V, 8.4V, 12.6V, (TYP.)
Constant voltage circuit output pin. Controls external P-MOS FET gate and
charges constant voltage.
Power supply input pin.
*
G : Constant voltage circuit input pin
External resistance ratio (R1 : R2) enables setting constant voltage circuit output voltage.
Low voltage detection voltage is set for one cell (4.1V or 4.2V).
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MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Block Diagram
MM1332A, B, C, D, E, F,
MM1332G
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