BATTERY PROTECTION IC

FOR 2-SERIAL OR 3-SERIAL-CELL PACK

S-8253A/B Series

Seiko Instruments Inc.

1

The S-8253A/B Series are protection ICs for 2-serial or 3-serial

cell lithium-ion rechargeable batteries and include high-accuracy

voltage detectors and delay circuits.

These ICs are suitable for protecting lithium-ion battery packs

from overcharge, overdischarge and overcurrent.

Features

(1)

High-accuracy voltage detection for each cell

• Overcharge detection voltage n (n = 1 to 3)

3.9 V to 4.4 V (50 mV steps)

Accuracy

±25 mV

• Overcharge release voltage n (n = 1 to 3)

3.8 V to 4.4 V

*1

Accuracy

±50 mV

• Overdischarge detection voltage n (n = 1 to 3)

2.0 V to 3.0 V (100 mV steps)

Accuracy

±80 mV

• Overdischarge release voltage n (n = 1 to 3)

2.0 V to 3.4 V

*2

Accuracy

±100 mV

(2)

Three-level overcurrent detection (Including load short circuiting detection)

• Overcurrent detection voltage 1

0.05 V to 0.30 V (50 mV steps) Accuracy

±25 mV

• Overcurrent detection voltage 2

0.5 V (Fixed)

• Overcurrent detection voltage 3

1.2 V (Fixed)

(3)

Delay times (Overcharge, Overdischarge, Overcurrent) are generated by an internal circuit. (External capacitors are

unnecessary).

(4)

Charge / discharge operation can be inhibited via the control pin.

(5)

0 V battery charge function available / unavailable are selectable.

(6)

High-voltage withstand devices

Absolute maximum rating 26 V

(7)

Wide operating voltage range

2 to 24 V

(8)

Wide operating temperature range

−40 to +85 °C

(9)

Low current consumption

• Operation mode

28

• Power-down mode

0.1

(10) Lead-free products

*1. Overcharge release voltage

= Overcharge detection voltage − Overcharge hysteresis voltage

(Overcharge hysteresis voltage n (n

= 1 to 3) can be selected as 0 V or from a range of 0.1 to 0.4 V in

50 mV steps.)

*2. Overdischarge release voltage

= Overdischarge detection voltage + Overdischarge hysteresis voltage

(Overdischarge hysteresis voltage n (n

= 1 to 3) can be selected as 0 V or from a range of 0.2 to 0.7 V in

100 mV steps.)

Applications

• Lithium-ion rechargeable battery packs

• Lithium polymer rechargeable battery packs

Package

Drawing Code

Package Name

Package

Tape

Reel

8-Pin TSSOP

FT008-A

FT008-E

FT008-E