S-8244 Series BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK www.ablic.com (SECONDARY PROTECTION) ABLIC Inc., 2003-2020 Rev.7.1 00 The S-8244 Series is used for secondary protection of lithium-ion batteries with from one to four cells, and incorporates a high-precision voltage detector circuit and a delay circuit. Short-circuiting between cells makes it possible for serial connection of one to four cells. Features (1) Internal high-precision voltage detector circuit Overcharge detection voltage range: 3.700 V to 4.550 V: Accuracy of 25 mV (at +25C) (at a 5 mV/step) Accuracy of 50 mV (at 40C to +85C) Hysteresis: 5 types 0.38 0.1 V, 0.25 0.07 V, 0.13 0.04 V, 0.045 0.02 V, None (2) High-withstand voltage: Absolute maximum rating: 26 V (3) Wide operating voltage range: 3.6 V to 24 V (refers to the range in which the delay circuit can operate normally after overvoltage is detected) (4) Delay time during detection: Can be set by an external capacitor. (5) Low current consumption: At 3.5 V for each cell: 3.0 A max. (+25C) At 2.3 V for each cell: 2.4 A max. (+25C) (6) Output logic and form: 5 types CMOS output active H CMOS output active L Pch open drain output active L Nch open drain output active H Nch open drain output active L (CMOS / Nch open drain output for 0.045 V hysteresis models) (7) Lead-free (Sn 100%), halogen-free Applications Lithium ion rechargeable battery packs (secondary protection) Packages SNT-8A TMSOP-8 1 BATTERY PROTECTION IC FOR 1-SERIAL TO 4-SERIAL-CELL PACK (SECONDARY PROTECTION) S-8244 Series Rev.7.1 00 Block Diagram VCC Overcharge detection SENSE comparator 1 + - Reference voltage 1 Overcharge Overcharge detection VC1 detection ICT comparator 2 delay circuit + - Control Reference voltage 2 logic VC2 Overcharge detection comparator 3 + - CO Reference voltage 3 VC3 Overcharge detection comparator 4 + - Reference voltage 4 VSS Remark In the case of Nch open-drain output, only the Nch transistor will be connected to the CO pin. In the case of Pch open-drain output, only the Pch transistor will be connected to the CO pin. Figure 1 2