S-8261 Series

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BATTERY PROTECTION IC FOR 1-CELL PACK

© Seiko Instruments Inc., 2001-2014

Seiko Instruments Inc.

1

The S-8261 Series is a lithium-ion / lithium polymer rechargeable battery protection IC incorporating high-accuracy voltage

detection circuit and delay circuits.

The S-8261 Series is 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 4.5 V (applicable in 5 mV step)

Accuracy:

±25 mV (+25°C) and

±30 mV (−5°C to +55°C)

• Overcharge hysteresis voltage

0.1 V to 0.4 V

*1

Accuracy:

±25 mV

The overcharge hysteresis voltage can be selected from the range 0.1 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)

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” is selectable.

(6)

Power-down function “Yes” / “No” is selectable.

(7)

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).

(8)

Low current consumption

• Operation mode

3.5

μA typ., 7.0 μA max.

• Power-down mode

0.1

μA max.

(9)

Wide operating temperature range

−40°C to +85°C

(10) Lead-free, Sn 100%, halogen-free

*3

*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.)

*3. Refer to “ Product Name Structure” for details.



Applications

• Lithium-ion rechargeable battery packs

• Lithium polymer rechargeable battery packs



Package

• SOT-23-6