Outline]
This IC protects lithium-ion batteries in the event of overcharge, overdischarge and overcurrent. It has the following two functions: an overcharge detection function that turns the external FET-SW off when a problem occurs during charging, etc. and excess voltage is impressed on each battery for longer than a certain time, and an overdischarge detection function that turns the external FET-SW off when battery voltage drops below a certain voltage during discharge, in order to prevent battery overdischarge. When these functions operate, the IC enters low current consumption mode. It also has an overcurrent detection function that turns the FET-SW off when excess current flows due to a short or the like. Since the functions above are provided, the protection circuitry for lithium-ion batteries can be comprised with fever external components.

[Features]
1. Consumption current (during overcharge) VCELL = 4.5 ROC = 270 k�[ 150�gA typ.
2. Consumption current (normal) VCELL = 3.5V 15�gA typ.
3. Consumption current (during overdischarge) VCELL = 1.9V 0.5�gA typ.
4. Consumption current (during overdischarge) VCELL = 1.0V 0.1�gA max.
5. Overcharge detection voltage (Ta = 0oC ~ 50oC) 4.35 �� 0.025V (detected for each cell)
6. Hysteresis voltage 220mV �� 50mV (detected for each cell)
7. Overdischarge detection voltage 2.30 �� 0.1V (detected for each cell)
8. Overdischarge release voltage 3.50V �� 0.2V (detected for each cell)
9. Overcurrent detection threshold 150mV �� 15mV
10. Reset after overcurrent detection Load open (5MEG�[ or higher)
11. Operating limit voltage 0.9V max.