Rev.1.4_00
BATTERY PROTECTION IC
FOR 2-SERIAL-CELL PACK
S-8242B Series
The S-8242B Series are protection ICs for 2-serial-cell
lithium-ion/lithium polymer rechargeable batteries and
include high-accuracy voltage detectors and delay circuits.
These ICs are suitable for protecting 2-cell rechargeable
lithium-ion / lithium polymer battery packs from overcharge,
overdischarge, and overcurrent.
Features
(1) High-accuracy voltage detection for each cell
• Overcharge detection voltage n (n = 1, 2)
• Overcharge release voltage n (n = 1, 2)
• Overdischarge detection voltage n (n = 1, 2)
• Overdischarge release voltage n (n = 1, 2)
3.9 V to 4.5 V (50 mV steps)
3.8 V to 4.5 V*1
Accuracy 25 mV
Accuracy 50 mV
Accuracy 50 mV
Accuracy 100 mV
2.0 V to 3.0 V (100 mV steps)
2.0 V to 3.4 V*2
*1. Overcharge release voltage = Overcharge detection voltage − Overcharge hysteresis voltage
(Overcharge hysteresis voltage n (n = 1, 2) can be selected as 0 V or from a range of 0.1 V to
0.4 V in 50 mV steps.)
*2. Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis voltage
(Overdischarge hysteresis voltage n (n = 1, 2) can be selected as 0 V or from a range of 0.1 V to
0.7 V in 100 mV steps.)
(2) Two-level overcurrent detection (overcurrent 1, overcurrent 2)
• Overcurrent detection voltage 1
• Overcurrent detection voltage 2
0.05 V, 0.08 V to 0.30 V (10 mV steps)
1.2 V (fixed)
Accuracy 15 mV
Accuracy 300 mV
(3) Delay times (overcharge, overdischarge, overcurrent) are generated by an internal circuit (external capacitors are
unnecessary).
(4) 0 V battery charge function available/unavailable are selectable.
(5) Charger detection function
• The overdischarge hysteresis is released by detecting negative voltage at the VM pin (−0.7 V typ.) (Charger
detection function).
(6) High-withstanding-voltage devices
(7) Wide operating temperature range
(8) Low current consumption
Operation mode
Absolute maximum rating: 28 V
−40°C to +85 °C
10 µA max. (+25°C)
0.1 µA max. (+25°C)
SNT-8A, 8-Pin TSSOP
Power-down mode
(9) Small package
(10) Lead-free products
Applications
• Lithium-ion rechargeable battery packs
• Lithium polymer rechargeable battery packs
Packages
Package Name
Package
Drawing Code
Tape
Reel
Land
PH008-A
SNT-8A
PH008-A
FT008-A
PH008-A
FT008-E
PH008-A
FT008-E
8-Pin TSSOP
Seiko Instruments Inc.
1