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