BATTERY PROTECTION IC FOR 3-SERIAL- OR 4-SERIAL-CELL PACK

The S-8254A Series is a protection IC for 3-serial- or 4-serial-cell lithium-ion / lithium polymer rechargeable batteries and includes a high-accuracy voltage detector and delay circuit.

The S-8254A Series protects both 3-serial or 4-serial cells using the SEL pin for switching.

Features

(1) High-accuracy voltage detection for each cell

• Overcharge detection voltage n (n = 1 to 4) 3.9 V to 4.4 V (50 mV step) Accuracy ±25 mV

• Overcharge release voltage n (n = 1 to 4) 3.8 V to 4.4 V*1 Accuracy ±50 mV

• Overdischarge detection voltage n (n = 1 to 4) 2.0 V to 3.0 V (100 mV step) Accuracy ±80 mV

• Overdischarge release voltage n (n = 1 to 4) 2.0 V to 3.4 V*2 Accuracy ±100 mV

(2) Three-level overcurrent protection

• Overcurrent detection voltage 1 0.05 V to 0.30 V (50 mV step) Accuracy ±25 mV

• Overcurrent detection voltage 2 0.5 V Accuracy ±100 mV

• Overcurrent detection voltage 3 VVC1 − 1.2 V Accuracy ±300 mV

(3) Delay times for overcharge detection, overdischarge detection and overcurrent detection 1 can be set

by external capacitors (delay times for overcurrent detection 2 and 3 are fixed internally).

(4) Switchable between a 3-serial cell and 4-serial cell using the SEL pin

(5) Charge/discharge operation can be controlled via the control pins.

(6) High-withstand voltage Absolute maximum rating : 26 V

(7) Wide operating voltage range 2 V to 24 V

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

(9) Low current consumption

• During operation 30 μA max. (+25°C)

• During power-down 0.1 μA max. (+25°C)

(10) Lead-free, Sn100, halogen-free*3

Applications

• Lithium-ion rechargeable battery packs

• Lithium polymer rechargeable battery packs