MITSMI MM1294B, MM1294C, MM1294A Datasheet
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Protection of Lithium Ion Batteries (four cells in series)
Monolithic IC MM1294
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 (overdischarge 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 170µA typ.
2. Current consumption (normal operation) V
CELL < VALM 35µA 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
4-Cell Protection ICs
Rank
Overcharge Overcharge
Overdischarge Overdischarge
Overcurrent At overcurrent Overcurrent
detection voltage hysteresis voltage detection voltage
resume voltage
detection voltage
detection
release conditions
A
4.35V±50mV
200mV typ. 2.35V typ. 3.05V typ.
150mV typ.
Pin 3 (DOHG pin) L H
Load release
300kΩ or more
B
4.25V±50mV
2.40V typ. 3.10V typ.
C
Same as rank A
200mV typ. Same as rank A Charging reset
MITSUMI
Protection of Lithium Ion Batteries (four cells in series) MM1294
Block Diagram
Pin Assignment
SSOP-16
13 762458
16 13 1115 14 12910
1 OV 9 V1
2 CS 10
3 DCHG 11 V2
4 PF 12
5 CDC 13 V3
6 COL 14
7 COV 15 V4
8 GND 16 V
CC
Loading...