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PRODUCT DATASHEET

AAT3783

BatteryManager

TM

1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection

General Description

The AAT3783 BatteryManager鈩?is a single-cell Lithium-

Ion (Li-Ion)/Li-Polymer battery charger IC, designed to

operate from USB ports, AC adapter inputs, or from a

charger adapter up to an input voltage of 6.5V. For

increased safety, the AAT3783 also includes over-voltage

input protection (OVP) up to 28V.

The AAT3783 precisely regulates battery charge voltage

and current for 4.2V Li-Ion/Polymer battery cells through

an extremely low R

DS(ON)

switch. When charged from an

adapter or a USB port, the battery charging current can

be set by an external resistor up to 1A. In the case of an

over-voltage condition in excess of 6.5V, a series switch

opens preventing damage to the battery and charging

circuitry. With the addition of an external resistor the

OVP trip point can be programmed to a level other than

the factory set value of 6.5V. In the case of an OVP con-

dition a fault flag is activated.

Battery charge state is continuously monitored for fault

conditions. In the event of an over-current, battery over-

voltage, short-circuit or over-temperature failure, the

device will automatically shut down, thus protecting the

charging device, control system and the battery under

charge. A status monitor output pin is provided to indi-

cate the battery charge status by directly driving an exter-

nal LED. An open-drain power-source detection output

(ADPP) is provided to report the power supply status.

The AAT3783 comes in a thermally enhanced, space-

saving, Pb-free 16-pin 3x4 mm TDFN package and is

specified for operation over the -40擄C to +85擄C tem-

perature range.

Features

鈥?USB or AC Adapter System Power Charger

鈥?Programmable from 100mA to 1A Max

鈥?4.0V ~ 7.5V Input Voltage Range

鈻?/div>

Over-Voltage Input Protection up to 28V

鈥?High Level of Integration with Internal:

鈻?/div>

Charging Device

鈻?/div>

Reverse Blocking Diode

鈻?/div>

Current Sensing

鈥?Digital Thermal Regulation

鈥?Charge Current Programming (ISET)

鈥?Charge Termination Current Programming (TERM)

鈥?Charge Timer (CT)

鈥?Battery Temperature Sensing (TS)

鈥?TS Pin Open Detection

鈥?Automatic Recharge Sequencing

鈥?No Trickle Charge Option Available

鈥?Full Battery Charge Auto Turn Off / Sleep State /

Charge Termination

鈥?Automatic Trickle Charge for Battery Pre-conditioning

鈥?Battery Over-Voltage and Over-Current Protection

鈥?Emergency Thermal Protection

鈥?Power On Reset

鈥?16-pin 3x4mm TDFN Package

Applications

鈥?/div>

Bluetooth鈩?Headsets, Headphones, Accessories

Digital Still Cameras

Mobile Phones

MP3 Players

Personal Data Assistants (PDAs)

Other Li-Ion/Polymer Battery Powered Devices

Typical Application

V

IN

FLT

OVP

INCHR

2.2渭F

STAT

ADPP

Enable Charging

Enable OVP

ENCHR

ENOVP

GND

TERM

ISET

R

SET

R

TERM

C

T

TS

CT

Battery

Pack

TEMP

BATS

BAT

BATT+

AAT3783

10渭F

BATT-

3783.2007.12.1.0

www.analogictech.com

1

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