AAT3688AIWP-4.2-4-T1 AnalogicTech, AAT3688AIWP-4.2-4-T1 Datasheet

AAT3688AIWP-4.2-4-T1

Manufacturer Part Number

AAT3688AIWP-4.2-4-T1

Description

USB Port Lithium-Ion/Polymer Battery Charger

Manufacturer

AnalogicTech

Datasheet

1.AAT3688AIWP-4.2-4-T1.pdf (21 pages)

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General Description

The AAT3688 BatteryManager™ 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 battery 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 cur-

rent from a USB port, while keeping the port voltage

regulated.

Battery temperature and charge state are fully moni-

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

age or over-temperature failure, the device will auto-

matically 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 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 temperature range.

Typical Application

BatteryManager

3688.2007.12.1.6

USB Hi/Lo Select

USB Input

Enable

SETH

w w w . a n a l o g i c t e c h . c o m

SETL

USB

USBSEL

USBH

USBL

STAT1

USB Port Lithium-Ion/Polymer Battery Charger

AAT3688

STAT2

Features

• USB Charger

• 4.0V to 5.5V Input Voltage Range

• High Level of Integration With Internal:

• 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

DATA

CHR

GND

BAT

▪

Programmable up to 500mA Max

Charging Device

Reverse Blocking Diode

Current Sensing

PRODUCT DATASHEET

10µF

BATT+

BATT-

TEMP

AAT3688

Serial Data

Battery Pack

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