BATTERY PROTECTION IC FOR 1-CELL PACK

The S-8241 Series is a series of lithiumion/lithium polymer rechargeable battery protection ICs incorporating high-accuracy voltage detection circuits and delay circuits.

These ICs are suitable for protection of 1-cell lithium ion/lithium polymer battery packs from overcharge, overdischarge and overcurrent.

„Features

(1) Internal high-accuracy voltage detection circuit

•Overcharge detection voltage: 3.9 to 4.4 V (5 mV-step)

Accuracy of ±25 mV(+25 °C) and ± 30 mV(−5 to +55 °C)

•Overcharge release voltage: 3.8 to 4.4 V*1 Accuracy of ±50 mV

•Overdischarge detection voltage: 2.0 to 3.0 V (100 mV-step) Accuracy of ±80 mV

•Overdischarge release voltage: 2.0 to 3.4 V*2 Accuracy of ±100 mV

•Overcurrent 1 detection voltage: 0.05 to 0.3 V (5 mV-step) Accuracy of ±20 mV

•Overcurrent 2 detection voltage: 0.5 V (fixed) Accuracy of ±100 mV

(2) A high voltage withstand device isused for charger connection pins

(VM and CO pins: Absolute maximum rating = 26 V)

(3) Delay times (overcharge: tCU; overdischarge: tDL; overcurrent 1: tlOV1 ; overcurrent 2: tlOV2) are generated by an internal circuit. (External capacitors are unnecessary.) Accuracy of ±30

(4) Internal three-step overcurrent detection circuit (overcurrent 1, overcurrent 2, and load short-circuiting)

(5) Either the 0 V battery charging function or 0 V battery charge inhibiting function can be selected.

(6) Products with and without a power-down function can be selected.

(7) Charger detection function and abnormal charge current detection function

•The overdischarge hysterisis is released by detecting a negative VM pin voltage (typ. −1.3 V) (Charger detection function).

•If the output voltage at DO pin is high and the VM pin voltage becomes equalto or lower than the charger detection voltage (typ. −1.3 V), the output voltage at CO pin goes low (Abnormal charge current detection function).

(8) Low current consumption

•Operation: 3.0 μA typ. 5.0 μA max.

•Power-down mode: 0.1 μA max.

(9) Wide operating temperature range: −40 to +85 °C

(10) Small package SOT-23-5, SNT-6A

(11) Lead-free products

*1.Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis

The overcharge hysteresis can be selected in the range 0.0, or 0.1 to 0.4 V in 50 mV steps. (However, selection

“Overcharge release voltage<3.8 V” is enabled.)

*2.Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis

The overdischarge hysteresis can be selected in the range 0.0 to 0.7 V in100 mV steps. (However, selection

“Overdischarge release voltage>3.4 V” is enabled.)

„Applications

•Lithium-ion rechargeable battery packs

•Lithium- polymer rechargeable battery packs