Rev.1.9
_00
BATTERY PROTECTION IC FOR SINGLE-CELL PACK
S-8261 Series
The S-8261 series are lithium-ion / lithium polymer
rechargeable battery protection ICs incorporating high-
accuracy voltage detection circuit and delay circuit.
The S-8261 series are suitable for protection of single-cell
lithium ion/lithium polymer battery packs from overcharge,
overdischarge and overcurrent.
Features
(1) Internal high accuracy voltage detection circuit
•
Overcharge detection voltage
3.9 V to 4.4 V (applicable in 5 mV step)
Accuracy:
±25
mV (+25
°C)
and
±30
mV (−5
°C
to
+55 °C)
•
Overcharge hysteresis voltage
0.0 V to 0.4 V
*1
Accuracy:
±25
mV
The overcharge hysteresis voltage can be selected from the range 0.0 V to 0.4 V in 50 mV step.
•
Overdischarge detection voltage
2.0 V to 3.0 V (applicable in 10 mV step) Accuracy:
±50
mV
•
Overdischarge hysteresis voltage 0.0 V to 0.7 V
*2
Accuracy:
±50
mV
The overdischarge hysteresis voltage can be selected from the range 0.0 V to 0.7 V in 100 mV step.
•
Overcurrent 1 detection voltage
0.05 V to 0.3 V (applicable in 10 mV step) Accuracy:
±15
mV
•
Overcurrent 2 detection voltage
0.5 V (fixed) Accuracy:
±100
mV
(2) High voltage device is used for charger connection pins
(VM and CO pins: absolute maximum rating
=
28 V)
(3) Delay times (overcharge: t
CU
, overdischarge: t
DL
, overcurrent 1: t
lOV1
, overcurrent 2: t
lOV2
) are generated
by an internal circuit. No external capacitor is necessary.
Accuracy:
±20%
(4) Three-step overcurrent detection circuit is included.
(overcurrent 1, overcurrent 2 and load short-circuiting)
(5) 0 V battery charge function “available” / “unavailable” are selectable.
(6) Charger detection function and abnormal charge current detection function
•
The overdischarge hysteresis is released by detecting negative voltage at the VM pin (−0.7 V typ.).
(Charger detection function)
•
When the output voltage of the DO pin is high and the voltage at the VM pin is equal to or lower than
the charger detection voltage (−0.7 V typ.), the output voltage of the CO pin goes low. (Abnormal
charge current detection function)
(7) Low current consumption
•
Operation mode
3.5
µA
typ., 7.0
µA
max.
•
Power-down mode
0.1
µA
max.
(8) Wide operating temperature range
−40 °C
to
+85 °C
(9) Small package SOT-23-6, 6-Pin SNB(B)
*1.
Overcharge release voltage
=
Overcharge detection voltage
−
Overcharge hysteresis voltage
(where overcharge release voltage
<
3.8 V is prohibited.)
*2.
Overdischarge release voltage
=
Overdischarge detection voltage
+
Overdischarge hysteresis voltage
(where overdischarge release voltage
>
3.4 V is prohibited.)
Applications
•
Lithium-ion rechargeable battery packs
•
Lithium polymer rechargeable battery packs
Seiko Instruments Inc.
1
SII [ SEIKO INSTRUMENTS INC ]
