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AAT3697

2A Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

BatteryManagerTM

General Description

The AAT3697 BatteryManager is a highly integrated sin-

gle-cell lithium-ion/polymer battery charger IC designed

to operate with AC adapter inputs. It requires a minimum

number of external components. The AAT3697 precisely

regulates battery charge voltage and current for 4.2V

lithium-ion/polymer battery cells. Adapter charge current

rates can be programmed up to 2.0A. An active thermal

management system regulates the fast charge constant

current for all ambient temperature and input vs. output

voltage conditions.

Battery temperature and charge state are fully moni-

tored for fault conditions. In the event of an over-voltage

or over-temperature failure, the device will automati-

cally shut down, thus protecting the charging device,

control system, and the battery under charge. Status

monitor output pins are provided to indicate the battery

charge status by directly driving two external LEDs. A

serial interface output is available to report 12 various

charging status states to a microcontroller.

The AAT3697 is available in a Pb-free, thermally-enhanced,

space-saving 12-pin TDFN 3x3mm package and is rated

over the -40°C to +85°C temperature range.

PRODUCT DATASHEET

AAT3697

2A Lithium-Ion/Polymer Battery Charger

Features

• Input Voltage Range: 4.0V to 5.5V

• Up to 2.0A Charging Current

• Adapter Present Indicator (ADPP#)

• High Level of Integration with Internal:

▪ Charging Device

▪ Reverse Blocking Diode

▪ Current Sensing

• Active Thermal Loop Charge Reduction

• Automatic Recharge Sequencing

• Battery Temperature Monitoring

• Full Battery Charge Auto Turn-Off / Sleep Mode

• Over-Voltage, Over-Current, and Over-Temperature

Protection

• Power On Reset and Soft Start

• Serial Interface Status Report

• 12-Pin 3x3mm TDFN Package

• -40°C to +85°C Temperature Range

Applications

• Cellular Telephones

• Digital Still Cameras

• Hand Held PCs

• MP3 Players

• Personal Data Assistants (PDAs)

• Other Lithium-Ion/Polymer Battery-Powered Devices

Typical Application

Adapter

Present

Enable

Serial Interface

Adapter

CIN

10µF

RSET

LED1

LED2

ADPP#

BAT

EN

DATA

AAT3697 TS

CT

ADP

ADPSET

STAT1

GND

STAT2

RB1

RB2

BATT+

VADP

COUT

+

RT1

10µF

BATT-

CT

0.1µF

TEMP

RT2

Battery

Pack

3697.2008.02.1.3

www.analogictech.com

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