S-8241ABFMC-GBFT2U Seiko

S-8241 Series BATTERY PROTECTION IC FOR 1-CELL PACK www.sii-ic.com Seiko Instruments Inc., 1999-2013 Rev.9.2 00 The S-8241 Series is a series of lithium ion/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 rechargeable battery packs from overcharge, overdischarge and overcurrent. Features (1) Internal high-accuracy voltage detection circuit Overcharge detection voltage: 3.9 V to 4.4 V (5 mV-step) Accuracy of 25 mV (+25C) and 30 mV (5 to +55C) *1 Overcharge release voltage: 3.8 V to 4.4 V Accuracy of 50 mV Overdischarge detection voltage: 2.0 V to 3.0 V (100 mV-step) Accuracy of 80 mV *2 Overdischarge release voltage: 2.0 V to 3.4 V Accuracy of 100 mV Overcurrent 1 detection voltage: 0.05 V to 0.32 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 is used for charger connection pins (VM and CO pins: Absolute maximum rating = 26 V) (3) Delay times (overcharge: t overdischarge: t overcurrent 1: t overcurrent 2: t ) are generated CU DL lOV1 lOV2 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 hysteresis 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 equal to 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 A typ. 5.0 A max. Power-down mode: 0.1 A max. (9) Wide operation temperature range: 40C to +85C *3 (10) Lead-free, Sn 100%, halogen-free *1. Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis The overcharge hysteresis can be selected in the range 0.0 V, or 0.1 V 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 V to 0.7 V in 100 mV steps. (However, selection Overdischarge release voltage>3.4 V is enabled.) *3. Refer to Product Name Structure for details. Applications Lithium-ion rechargeable battery pack Lithium- polymer rechargeable battery pack Packages SOT-23-5 SNT-6A Seiko Instruments Inc. 1 NOT RECOMMENDED FOR NEW DESIGNBATTERY PROTECTION IC FOR 1-CELL PACK Rev.9.2 00 S-8241 Series Block Diagram Delay circuit Clock generation circuit DO VDD Counter circuit Load short- circuiting detection circuit CO Level conversion circuit + 0V battery charging circuit R Overcharge COL 0V battery charge detection inhibition circuit comparator Overdischarge R VMD detection + comparator VM + Overcurrent 1 R VMS detection comparator Charger detection circuit The overdischarge hysterisis is released when + a charger is detected. Overcurrent 2 detection comparator VSS Remark The diodes in the IC are parasitic diodes. Figure 1 2 Seiko Instruments Inc. NOT RECOMMENDED FOR NEW DESIGN