Rev.7.6
_00
BATTERY PROTECTION IC
FOR 1-CELL PACK
S-8241 Series
The S-8241 Series is a series of lithium ion/lithium polymer rechargeable battery
protection ICs incorporating high-accuracy voltage detection circuits and delay
circuits.
These ICs are suitable for protection of 1-cell lithium ion/lithium polymer battery
packs from overcharge, overdischarge and overcurrent.
Features
Internal high-accuracy voltage detection circuit
•
Overcharge detection voltage:
3.9 to 4.4 V (5 mV-step)
Accuracy of ±25 mV(+25
°C)
and ± 30 mV(−5 to +55
°C)
*1
•
Overcharge release voltage:
3.8 to 4.4 V
Accuracy of ±50 mV
•
Overdischarge detection voltage: 2.0 to 3.0 V (100 mV-step) Accuracy of ±80 mV
*2
Accuracy of ±100 mV
•
Overdischarge release voltage:
2.0 to 3.4 V
•
Overcurrent 1 detection voltage: 0.05 to 0.3 V (5 mV-step)
Accuracy of ±20 mV
•
Overcurrent 2 detection voltage: 0.5 V (fixed)
Accuracy of ±100 mV
(2) A high voltage withstand device is used for charger connection pins
(VM and CO pins: Absolute maximum rating = 26 V)
(3) Delay times (overcharge: t
CU
; overdischarge: t
DL
; overcurrent 1: t
lOV1
; overcurrent 2: t
lOV2
) are generated
by an internal circuit. (External capacitors are unnecessary.)
Accuracy of ±30%
(4) Internal three-step overcurrent detection circuit (overcurrent 1, overcurrent 2, and load short-circuiting)
(5) Either the 0 V battery charging function or 0 V battery charge inhibiting function can be selected.
(6) Products with and without a power-down function can be selected.
(7) Charger detection function and abnormal charge current detection function
•
The overdischarge hysterisis is released by detecting a negative VM pin voltage (typ.
−1.3
V) (Charger detection
function).
•
If the output voltage at DO pin is high and the VM pin voltage becomes equal to or lower than the charger detection
voltage (typ.
−1.3
V), the output voltage at CO pin goes low (Abnormal charge current detection function).
(8) Low current consumption
•
Operation:
3.0
μA
typ. 5.0
μA
max.
•
Power-down mode: 0.1
μA
max.
(9) Wide operating temperature range:
−40
to +85
°C
(10) Small package SOT-23-5, SNT-6A
(11) Lead-free products
*1.
Overcharge release voltage = Overcharge detection voltage - Overcharge hysteresis
The overcharge hysteresis can be selected in the range 0.0, or 0.1 to 0.4 V in 50 mV steps. (However, selection
“Overcharge release voltage<3.8 V” is enabled.)
*2.
Overdischarge release voltage = Overdischarge detection voltage + Overdischarge hysteresis
The overdischarge hysteresis can be selected in the range 0.0 to 0.7 V in 100 mV steps. (However, selection
“Overdischarge release voltage>3.4 V” is enabled.)
(1)
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium- polymer rechargeable battery packs
Packages
Package name
SOT-23-5
SNT-6A
Drawing code
Package
MP005-A
PG006-A
Tape
MP005-A
PG006-A
Reel
MP005-A
PG006-A
Land
⎯
PG006-A
Seiko Instruments Inc.
1
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