Overview: 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 Overcurrent Overcharge Overcharge Overdischarge Overdischarge Overcurrent At 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.
