Outline

This is a protection IC for one-cell series that protects lithium ion batteries during excess charging, discharging, or overcurrent. If abnormalities occur during charging and excess voltage is applied, it has a function that turns off the external FET switch when voltage is applied to each battery beyond a specified time (overcharging detection). It also has a function that turns off the external FET switch when the voltage for each battery falls below a set voltage, to prevent excess discharge when discharging the battery (discharging detection). At that time, the IC is switched to low current consumption mode. Also, when there is a large current flow due to shorting or other reasons, there is a functions for turning off the external FET switch (overcurrent detection). These function comprise a protection circuit, with few external parts, for lithium ion batteries.

Features

1. Current consumption (during overcharging) VCC=4.5V VCC pin 40µA typ. VIN pin 3µA typ.

2. Current consumption (normal) VCC=3.5V VCC pin 7µA typ. VIN pin 2µA typ.

3. Current consumption (during excess discharge) VCC=1.9V 0.7µA typ.

4. Consumption current (during excess discharge) VCC=1.0V 0.17µA max.

5. Overcharge detection voltage (Ta=-20°C~+70°C) A 4.35V±50mV

B 4.25V±50mV

C 4.10V±50mV

6. Overcharge detection hysteresis A 200mV typ.

B 200mV typ.

C 27mV typ.

7. Overcharge non-induction time CTD=0.082µF 1S typ.

8. Excess discharge voltage 1 VCS=0V 2.6V±0.1V

9. Excess discharge voltage 2 VCS=0.05V 2.4V±0.1V

10.Excess discharge reset voltage 2.9V±0.12V

11.Excess discharge during non-induction 10mS typ.

12.Overcurrent detection voltage A 100mV±10mV

B 100mV±10mV

C 150mV±15mV

13.Reset after overcurrent detection load release

14.Overcurrent detection non-induction time 10mS typ.

Applications

1. Cellular phones

2. PHS

3. MD

4. others