Outline

This is a 3-cell series protection IC is for protecting a lithium ion battery from overcharging and excess discharging. If abnormalities occur during charging and excess voltage is applied, it has a function that turns off the external FET switch (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.

These functions comprise a protection circuit, with few external parts, for lithium ion batteries.

Features

1. Current consumption (for VCC pin)  VCELL=4.4V    700µA typ.

2. Current consumption (for VCC pin)  VCELL=4.2V    300µA typ.

3. Current consumption (for VCC pin)  VCELL=3.8V    25µA typ.

4. Current consumption (for VCC pin)  VCELL=2.2V    0.1µA max.

5. Current consumption (for BATH pin) VCELL=4.4V    12µA typ.

6. Current consumption (for BATH pin) VCELL=3.8V    8µA typ.

7. Current consumption (for BATH pin) VCELL=2.2V    1µA typ.

8. Charge prohibit voltage (Ta=-20°C~+70°C) B : 4.35V±50mV

                                                            C : 4.25V±50mV

9. Charge prohibit release voltage VCELLU-45mV

10.Charge prohibit detection function operation voltage B : 4.20V typ.

                                                                          C : 4.10V typ.

11.Excess discharge detection voltage 2.40V±0.09V, 2.35V±0.09V

12.Discharge resumption voltage B : 2.65V±0.16V

                                            C : 2.60V±0.16V

13.Excess discharge detection hysteresis voltage 250±75mV

Applications

1. Notebook PCs

2. Portable terminals

3. Others