MITSMI MM1293C, MM1293D, MM1293E, MM1293F, MM1293A Datasheet
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MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Protection of Lithium Ion Batteries (three cells in series)
Monolithic IC MM1293
Outline
This IC provides protection for lithium ion batteries in the event of overcharging, overdischarging and
overcurrents. When anomalies occur during charging or at other times and excessive voltages are applied,
after a certain time has elapsed for each cell an external FET switch is turned off (overcharging detection) ;
and in order to prevent overdischarge of the battery during discharge, when the voltage of individual batteries
falls below a fixed voltage, an external FET switch is turned off (overdischarging detection), and the IC is put
into low-consumption current mode. When large currents flow due to a short-circuit or other cause, an
external MOS switch is turned off (overcurrent detection).
Package
SSOP-16
Features
1. Current consumption (overcharging) VCELL > VCELLU 125µA typ.
2. Current consumption (normal operation) V
CELL < VALM 30µA typ.
3. Current consumption (overdischarge) V
CELL < VCELLS 0.1µA max.
4. Overcharge detection voltage (
-
20 to +70°C) VCELL : L H 4.25V±50mV/CELL
5. Overcharge hystereis voltage V
CELL : H L VCELLU
-
200mV/CELL typ.
6. Overcharge sensing dead time C=0.1µF 1.0S typ.
7. Overcharge sensing operation voltage V
CELL : L H 4.10V±150mV/CELL
8. Overdischarge detection voltage V
CELL : H L 2.40V/CELL typ.
9. Overdischarge sensing dead time C=0.1µF 1.0S typ.
10.Overcurrent detection voltage 0.15V typ.
11.Overcharge and overdischarve voltages as well as the overcurrent detection voltage can be changed upon
request.
Applications
Lithium ion battery pack for notebook computers
3-Cell Protection ICs
Rank
Overcharge Overcharge
Overdischarge Overdischarge
Overcurrent At overcurrent
Overcurrent release
detection voltage
hysteresis voltage
detection voltage
resume voltage detection voltage
detection conditions
A
4.35V±50mV
200mV typ. 2.35V typ. 3.05V typ.
150mV typ.
Pin 3 (DOHG pin) L H
Load release
250kΩ or more
B
4.25V±50mV
2.40V typ. 3.10V typ.
C
Same as rank A
Same as rank A
Pin 4 (OL pin) H L
D
Same as rank B
Same as rank B
E
none (several mV)
Same as rank B
Pin 3 (DOHG pin) L H
F
4.10V±50mV
2.35V typ. 3.00V typ.
G
Same as rank A
200mV typ.
Same as rank A Charging reset
MITSUMI
Protection of Lithium Ion Batteries (three cells in series) MM1293
Block Diagram
Pin Assignment
SSOP-16
13 762458
16 13 1115 14 12910
1 OV 9 GND
2 CS 10 ML
3 DCHG 11 BATL
4 PF 12 MM
5 CDC 13 BATM
6 COL 14 MH
7 COV 15 BATH
8 MSW 16 V
CC
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