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=-20C+~70C)
3Cell : 12.3V/12.6V150mV
2Cell : 8.2V/8.4V100mV
1Cell : 4.1V/4.2V50mV
2. Current consumption
250A 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=25C)
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~V
CC
V
SW input voltage
V
SW
-0.3~V
CC
+0.3
V
Allowable power dissipation
Pd
300
mW
MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Electrical Characteristics
(Unless otherwise specified Ta=25C, V
CC
=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
CC
1
VSW1=VSW2=OV (Charge : ON)
250
A
Current consumption 2
I
CC
2
VSW1=VSW2=V
CC
(Charge : OFF)
2
A
Output voltage
V
O
Ta=-20~+70C, MM1332A, B, C
4.05
4.10
4.15
V/sell
Ta=-20~+70C, 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
k
/sell
MM1332D, E, F
840
SW1 input current
I
SW
1
20
A
V
L
1
Charge : ON
-0.3
2.0
V
SW1 input voltage
V
H
1
Charge : OFF
VCC
VCC
V
-1.0
+0.3
Low-voltage detection voltage
L
V
A~F Rank
1.90
2.00
2.10
G Rank
2.00
2.15
2.30
V/sell
SW2 input current
I
SW
2
20
A
V
L
2
Low-voltage detection circuit : ON
-0.3
2.0
V
SW2 input voltage
V
H
2
Low-voltage detection circuit : OFF
VCC
VCC
V
-1.0
+0.3
Low voltage detection
I
LV
0.2
A
output leak current
Low voltage detection
V
LV
I
SINK
=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
MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Pin Assignment Description
1
4
3
2
8
5
6
7
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).
MITSUMI
Control of Lithium Ion Batteries Charging MM1332
Block Diagram
MM1332A, B, C, D, E, F,
MM1332G
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