Advanced Analog Technology, Inc.

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V2.0

AAT8661 Series

Product information presented is current as of publication date. Details are subject to change without notice.

ONE-CELL LI-ION BATTERY PROTECTION IC

FEATURES

Ideal for One-Cell Rechargeable Li-Ion

Battery Packs

High Accuracy Voltage Detection

Low Current Consumption:

A

3

μ Supply Current (Typical)

A

1

.

0

μ Shutdown Current

3-Level Over Current Detection:

Over-Current Level 1 /Over Current Level 2

/ Short Circuit

Wide

Operating

Temperature

Range:

C

85

to

C

40

ο

ο

−

Small SOT26 Package

PIN CONFIGURATION

NULL

out

D

VN

out

C

GND

DD

V

GENERAL DESCRIPTION

The AAT8661 series are designed to protect

one-cell rechargeable Li-Ion battery pack against

over-charge, over-discharge, over-current and

short circuit. They use CMOS process to provide

high accuracy voltage detection and low current

consumption.

Each of the AAT8661 devices incorporates

voltage comparators, bandgap reference voltage

generator, signal delay circuit, short circuit

detector, and digital control circuit.

In the charge process, when the battery voltage is

charged to a value greater than

1

C

V (Over-Charge

Threshold Voltage), the output of

out

C

pin

The output of

out

C

pin will switch to high level

(Over-Charge Release Voltage), or when the

charger is disconnected from the battery pack and

During the discharge process, when the battery

voltage drops to a value lower than

1

D

V

(Over-Discharge Threshold Voltage), the output

of

out

D

pin switches to low level immediately

after the internal delay time elapses. The output

of

out

D

pin will switch to high level when the

battery voltage is at a level higher than

2

D

V

(Over-Discharge Release Voltage).

Over current level 1 voltage (

1

OC

V

) is used to