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AAT3681A

500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

AAT3681A

500mA USB Port or AC Adapter

Lithium-Ion/Polymer Battery Charger

General Description

BatteryManager™

Features

The AAT3681A BatteryManager is an integrated sin-

gle cell lithium-ion/polymer battery charger IC,

designed to operate from a DC power source or

USB port up to an input voltage of 7.5V. It requires

just one external component.

The AAT3681A precisely regulates battery charge

voltage and current for 4.2V (4.375V option) lithium-

ion/polymer battery cells. When charged from an

AC adapter or USB port, the battery charging cur-

rent can be set by an external resistor up to 500mA.

Battery charge state is continuously monitored for

fault conditions. In the event of an over-voltage,

short-circuit, or over-temperature failure, the

device will automatically shut down, thus protecting

the charging device, control system, and the bat-

tery under charge. A status monitor output pin is

provided to indicate the battery charge status by

directly driving an external LED.

The AAT3681A is available in a Pb-free, thermally

enhanced, space-saving 8-pin 2.0x2.1mm SC70JW

package and is specified for operation over the

-40°C to +85°C temperature range.

Typical Application

• USB or AC Adapter System Power Charger

— Programmable from 15mA to 500mA

• 4.0V ~ 7.5V Input Voltage Range

• High Level of Integration with Internal:

— Charging Device

— Reverse Blocking Diode

• Automatic Current Sensing

• Automatic Recharge Sequencing

• Full Battery Charge Auto Turn Off/Sleep

Mode/Charge Termination

• Shutdown Current <1µA

• Automatic Trickle Charge for Battery Pre-

Conditioning (AAT3681A-1 is No Trickle

Charge Option)

• Over-Voltage and Emergency Thermal

Protection

• Power On Reset and Soft Start

• LED Status Pin

• 8-Pin 2.0x2.1mm SC70JW Package

Applications

• Bluetooth® Headsets

• DECT Headsets

• Digital Still Cameras

• MP3, Portable Music, and Portable Media

Players

• Personal Data Assistants (PDAs)

• Wrist Watches

• Other Lithium-Ion/Polymer Battery-Powered

Devices

Adapter/USB Input

Enable

RSET

ADP

BAT

AAT3681A

STAT

EN

ISET

GND

BATT+

C

BATT-

Battery

Pack

3681A.2007.10.1.2

1

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