S-8265C Series BATTERY PROTECTION IC WITH CELL BALANCING FUNCTION FOR 3-SERIAL TO 5-SERIAL CELL PACK www.ablic.com (SECONDARY PROTECTION) ABLIC Inc., 2019-2021 Rev.1.5 00 The S-8265C Series is a secondary protection IC with cell balancing function for lithium-ion rechargeable batteries, which includes high-accuracy voltage detection circuits, delay circuits, and FETs for cell balancing discharge. The cell balancing function is effective for balancing the voltage of serially connected batteries. Short-circuiting between cells enables cell balancing for serial connection of three cells to five cells. Features High-accuracy voltage detection circuit for each cell Cell balancing detection voltage n (n = 1 to 5): 2.700 V to 4.650 V (5 mV step) Accuracy 20 mV (Ta = +25C) Accuracy 25 mV (Ta = 10C to +60C) *1 Cell balancing release voltage n (n = 1 to 5) : 2.700 V to 4.650 V Accuracy 50 mV (Ta = +25C) *2 Overcharge detection voltage n (n = 1 to 5) : 2.750 V to 4.700 V (5 mV step) Accuracy 20 mV (Ta = +25C) Accuracy 25 mV (Ta = 10C to +60C) *3, *4 Overcharge release voltage n (n = 1 to 5) : 2.750 V to 4.700 V Accuracy 50 mV (Ta = +25C) Built-in cell balancing discharging FET for each cell Output form: CMOS output, Nch open-drain output Output logic: Active, active Built-in test mode function to check cell balancing detection voltage and overcharge detection voltage with shortened delay time High-withstand voltage: Absolute maximum rating 28 V Wide operation voltage range: 3.6 V to 26 V Wide operation temperature range: Ta = 40C to +85C Low current consumption During operation: 0.3 A typ., 0.7 A max. (Ta = +25C) Lead-free (Sn 100%), halogen-free *1. Cell balancing release voltage = Cell balancing detection voltage + Cell balancing hysteresis voltage (Cell balancing hysteresis voltage can be selected from a range of 0 mV to 400 mV in 50 mV step.) *2. Satisfy Overcharge detection voltage Cell balancing detection voltage + 50 mV when selecting them. *3. Overcharge release voltage = Overcharge detection voltage + Overcharge hysteresis voltage (Overcharge hysteresis voltage can be selected from a range of 0 mV to 400 mV in 50 mV step.) *4. Satisfy Overcharge release voltage Cell balancing release voltage + 50 mV when selecting them. Application Lithium-ion rechargeable battery pack Packages TMSOP-8 SNT-8A 1 BATTERY PROTECTION IC WITH CELL BALANCING FUNCTION FOR 3-SERIAL TO 5-SERIAL CELL PACK (SECONDARY PROTECTION) S-8265C Series Rev.1.5 00 Block Diagram 1. CMOS output product VDD VC1 Cell balancing detection comparator 1 Overcharge detection comparator 1 SW1 VC2 Cell balancing detection comparator 2 Overcharge detection comparator 2 SW2 Control logic VC3 Delay circuit Cell balancing CO detection comparator 3 Oscillator Overcharge detection comparator 3 SW3 VC4 Cell balancing detection comparator 4 Overcharge detection comparator 4 SW4 VC5 Cell balancing detection comparator 5 Overcharge detection comparator 5 SW5 VSS Figure 1 Remark The diodes in the figure are parasitic diodes. 2