MITSUMI
Control of Lithium Ion Battery Charging and Discharging MM1248
Control of Lithium Ion Battery Charging and Discharging
Monolithic IC MM1248
Outline
This IC was developed for use in controlling charging and discharging of lithium ion batteries (battery modules
with three cells connected in series). In charging control, the voltage of the battery module as a whole is
controlled in constant-voltage control. Discharge control and monitoring of overvoltage rely on monitoring of
the voltages of individual cells.
Features
1.
2.
3.
4.
5.
Charging control voltage
V
BATH
=12.465V±1.5% (Ta=-20°C~70°C)
Overcharge detection voltage
V
CELL
=4.335V±1.5% (Ta=-20°C~70°C)
Internal circuit for setting dead time (for overvoltage detection, discharge control)
Low consumption current on overdischarge
I
BATH
3=1µA typ.
High-precision internal overvoltage detection startup circuit (cell voltage 4.2V or higher at end of charging)
Package
SOP-16B (MM1248XF)
Absolute Maximun Ratings
Item
Storage temperature
Operating temperature
Input voltage
Charge voltage
Power supply voltage
(Except where noted otherwise, Ta=25°C)
Symbol
T
STG
T
OPR
V
IN
max.
V
BAT
max.
V
CC
max.
V
O
2 max.
Pd
Ratings
-40~+125
-20~+70
18
15
15
10
350
Units
°C
°C
V
V
V
V
mW
Voltage applied to OV2 pin
Allowable loss
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
