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S-8254

Seiko Instruments
Part Number S-8254
Manufacturer Seiko Instruments
Description BATTERY PROTECTION IC
Published Jul 21, 2007
Detailed Description Rev.2.3_00 BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK S-8254 Series The S-8254 series is a protection I...
Datasheet PDF File S-8254 PDF File

S-8254
S-8254

Overview
Rev.
2.
3_00 BATTERY PROTECTION IC FOR 3-SERIAL OR 4-SERIAL-CELL PACK S-8254 Series The S-8254 series is a protection IC for 3-serial or 4-serial cell lithium ion rechargeable batteries and includes a high-accuracy voltage detector and delay circuit.
The S-8254 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 steps) Accuracy ±25 mV *1 Accuracy ±50 mV Overcharge release voltage n (n = 1 to 4) 3.
8 V to 4.
4 V *1.
Overcharge hysteresis voltage n (n = 1 to 4) can be selected as 0 V or from a range of 0.
1 V to 0.
4 V in 50 mV steps.
(Overcharge hysteresis voltage = Overcharge detection voltage − Overcharge release voltage) • • www.
DataSheet4U.
com Overdischarge detection voltage n (n = 1 to 4) 2.
0 V to 3.
0 V (100 mV steps) *2 Accuracy ±80 mV Overdischarge release voltage n (n = 1 to 4) 2.
0 V to 3.
4 V Accuracy ±100 mV *2.
Overdischarge hysteresis voltage n (n = 1 to 4) can be selected as 0 V or from a range of 0.
2 V to 0.
7 V in 100 mV steps.
(Overdischarge hysteresis voltage = Overdischarge release voltage − Overdischarge detection voltage) (2) Three-level overcurrent protection • Overcurrent detection voltage 1 0.
05 V to 0.
3 V (50 mV steps) Accuracy ±25 mV • Overcurrent detection voltage 2 0.
5 V Accuracy ±100 mV • Overcurrent detection voltage 3 VC1 − 1.
2 V Accuracy ±300 mV 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.
) Switchable between a 3-serial cell and 4-serial cell using the SEL pin Charge/discharge operation can be controlled via the control pins.
Withstanding voltage element Wide operating voltage range Wide operating temperature range Low current consumption • • Operation mode 30 µA max.
(+25°C) Power-down mode 0.
1 µA max.
(+25°C) Absolute maximum ratin...


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