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AAT3688

USB Port Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

AAT3688

USB Port Lithium-Ion/Polymer Battery Charger

General Description

BatteryManager™

Features

The AAT3688 BatteryManager™ is a member of

AnalogicTech's Total Power Management IC™

(TPMIC™) product family. This device is a highly

integrated single cell lithium-ion/polymer battery

charger IC designed to operate with USB port

inputs. It requires the minimum number of external

components.

The AAT3688 precisely regulates battery charge

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

tery cells. Depending on the USB port type, the

AAT3688 charge current can be programmed for

two separate levels up to 500mA. An optional

Charge Reduction Loop is built in to allow users to

charge the battery with available current from a USB

port, while keeping the port voltage regulated.

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. A serial interface

output is available to report any one of 14 various

status states to a microcontroller.

The AAT3688 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 Charger

— Programmable up to 500mA Max

• 4.0V to 5.5V Input Voltage Range

• High Level of Integration With Internal:

— Charging Device

— Reverse Blocking Diode

— Current Sensing

• Automatic Recharge Sequencing

• Charge Reduction Loop for USB Charging

• Battery Temperature Monitoring

• Full Battery Charge Auto Turn-Off

• Over-Voltage Protection

• Emergency Thermal Protection

• Power On Reset and Soft Start

• Serial Interface Status Reporting

• 12-Pin 3x3mm TDFN Package

Applications

• Bluetooth™ Headsets

• 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

USB Hi/Lo Select

RSETH

USB

USBSEL

USBH

EN CHR

BAT

USBL

TS

RSETL

AAT3688

GND

STAT1

DATA

STAT2

BATT+

C2

10μF

BATT-

TEMP

Battery Pack

Serial Data

3688.2006.04.1.3

1

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