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MM1294

Protection of Lithium Ion Batteries (four cells in series)

Mitsumi 

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).

4-Cell Protection ICs

Rank

A

B

C

Overcharge Overcharge Overdischarge Overdischarge Overcurrent At overcurrent Overcurrent

detection voltage hysteresis voltage detection voltage resume voltage detection voltage detection release conditions

Load release

4.35V±50mV 200mV typ. 2.35V typ. 3.05V typ. 150mV typ. Pin 3 (DOHG pin) L H

300kΩ or more

4.25V±50mV

2.40V typ. 3.10V typ.

Same as rank A 200mV typ.

Same as rank A

Charging reset

Features

1. Current consumption (overcharging)

VCELL > VCELLU

170µA typ.

2. Current consumption (normal operation)

VCELL < VALM

35µA typ.

3. Current consumption (overdischarge)

VCELL < VCELLS

0.1µA max.

4. Overcharge detection voltage (-20 to +70°C) VCELL : L H

4.25V±50mV/CELL

5. Overcharge hystereis voltage

VCELL : H L

VCELLU-200mV/CELL typ.

6. Overcharge sensing dead time

C=0.1µF

1.0S typ.

7. Overcharge sensing operation voltage

VCELL : L H

4.10V±150mV/CELL

8. Overdischarge detection voltage

VCELL : 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.

Package

SSOP-16

Applications

Lithium ion battery pack for notebook computers

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