AAT3685(2006) Просмотр технического описания (PDF) - Analog Technology Inc

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AAT3685
(Rev.:2006)

Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

AAT3685

Lithium-Ion/Polymer Battery Charger

General Description

BatteryManager™

Features

The AAT3685 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 or

line adapter inputs. It requires the minimum number

of external components.

The AAT3685 precisely regulates battery charge volt-

age and current for 4.2V lithium-ion/polymer battery

cells. Regardless of the type of input power source

(USB or adapter), the AAT3685 can be programmed

for two separate constant current charge levels up to

1A. An optional Charge Reduction Loop is built in to

allow users to charge the battery with available cur-

rent from the charge supply, 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 AAT3685 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.

• Adapter or USB Charger

— Programmable up to 1A 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

• 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

• Cellular Telephones

• Digital Still Cameras

• Hand-Held PCs

• MP3 Players

• Personal Data Assistants (PDAs)

• Other Lithium-Ion/Polymer Battery-Powered

Devices

Typical Application

Enable

Adapter or USB Input

Input Hi/Lo Select

RSETH

ADP/USB EN CHR

PWRSEL

SETH

BAT

SETL

TS

RSETL

AAT3685

GND

BATT+

C2

10µF

BATT-

STAT1

DATA

STAT2

TEMP

Battery Pack

Serial Data

3685.2006.02.1.2

1

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