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AAT3689

0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

AAT3689

0.5A/1.0A USB Port/Adapter

Lithium-Ion/Polymer Battery Charger

General Description

BatteryManager™

Features

The AAT3689 BatteryManager is a highly integrat-

ed single cell lithium-ion/polymer battery charger

IC designed to operate with USB port and AC

adapter inputs. It requires a minimum number of

external components.

The AAT3689 precisely regulates battery charge

voltage and current for 4.2V lithium-ion/polymer bat-

tery cells. Adapter charge current rates may be pro-

grammed up to 1.0A. In the absence of an adapter

and with a USB port connected, the battery can also

be charged by USB power. The USB charge current

can be programmed up to 500mA. USB charging is

disabled when an adapter is present.

Battery temperature and charge state are fully

monitored for fault conditions. In the event of an

over-voltage or over-temperature failure, the

device will automatically shut down, thus protecting

the charging device, control system, and the bat-

tery under charge. Status monitor output pins are

provided to indicate the battery charge status by

directly driving two external LEDs.

The AAT3689 is available in a Pb-free, thermally-

enhanced, space-saving 12-pin 3x3mm TDFN

package and is rated over the -40°C to +85°C tem-

perature range.

• USB/AC Adapter System Power Charger

— USB: Programmable up to 500mA

— Adapter: Programmable up to 1.0A

• 4.0V to 5.5V Input Voltage Range

• Adapter Presence Automatically Disables

USB Charging

• High Level of Integration With Internal:

— Charging Devices

— Reverse Blocking Diodes

— Current Sensing

• Automatic Recharge Sequencing

• Battery Temperature Monitoring

• Full Battery Charge Auto Turn-Off

• Over-Current Protection

• Over-Voltage Protection

• Emergency Thermal Protection

• Power On Reset and Soft Start

• 12-Pin 3x3 TDFN Package

Applications

• Cellular Telephones

• Digital Still Cameras

• Hand-Held PCs

• MP3 Players

• Personal Data Assistants (PDAs)

• Other Lithium-Ion/Polymer Battery-Powered

Devices

Typical Application

Enable

USB Input

EN

USB

BAT

BATT+

RSETUSB

USBSET

TS

AAT3689 CT

C2

10μF

BATT-

ADP Input

CT

ADP

GND

ADPSET

RSETADP

STAT1

STAT2

TEMP

Battery Pack

3689.2006.11.1.0

1

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