The S-8250B Series is a protection IC for 1-cell lithium-ion / lithium polymer rechargeable batteries and includes high-accuracy voltage detection circuits and delay circuits.
The S-8250B Series is suitable for protecting 1-cell lithium-ion / lithium polymer rechargeable battery packs from overcharge, overdischarge and overcurrent. By adjusting power supply voltage dependency of discharge overcurrent detection voltage in accordance with ON resistance of the charge-discharge control FET, the S-8250B Series realizes high-accuracy discharge overcurrent detection.
Features
- High-accuracy discharge overcurrent detection circuit
- Discharge overcurrent detection voltage : 0.05 V to 0.15 V (1 mV step)
Accuracy ±10 mV (Ta = +25°C)
(Power supply voltage dependency can be set in accordance with ON resistance of the charge-discharge control FET.) - High-accuracy voltage detection circuit
- Overcharge detection voltage : 4.1 V to 4.6 V (5 mV step)
Accuracy ±20 mV (Ta = +25°C)
Accuracy ±25 mV (Ta = −10°C to +60°C) - Overcharge release voltage : 3.7 V to 4.6 V*1 Accuracy ±30 mV
- Overdischarge detection voltage : 2.0 V to 2.8 V (10 mV step) Accuracy ±50 mV
- Overdischarge release voltage : 2.0 V to 3.0 V*2 Accuracy ±100 mV
- Load short-circuiting detection voltage : 0.25 V to 0.50 V (50 mV step)
Accuracy ±50 mV - Charge overcurrent detection voltage : −0.20 V to −0.05 V (25 mV step)
Accuracy ±15 mV - Detection delay times are generated only by an internal circuit (External capacitors are unnecessary).
- 0 V battery charge function is selectable : Available, unavailable
- Power-down function is selectable : Available, unavailable
- Release condition of discharge overcurrent status is selectable
- Load disconnection, charger connection
- High-withstand voltage
- VM pin and CO pin: Absolute maximum rating 28 V
- Wide operation temperature range
- Ta = −40°C to +85°C
- Low current consumption
- During operation: 2.0 μA typ., 4.0 μA max. (Ta = +25°C)
- During power-down: 50 nA max. (Ta = +25°C)
- Lead-free (Sn 100%), halogen-free
*1. Overcharge release voltage = Overcharge detection voltage − Overcharge hysteresis voltage
(Overcharge hysteresis voltage can be selected from a range of 0 V to 0.4 V in 50 mV step.)
*2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage can be selected from a range of 0 V to 0.7 V in 100 mV step.)
Applications
- Lithium-ion rechargeable battery packs
- Lithium-polymer rechargeable battery packs