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AAT2557

500mA Battery Charger and 300mA

LDO Regulator for Portable Systems

General Description

The AAT2557 is a fully integrated 500mA battery

charger and a 300mA low dropout (LDO) linear

regulator. The input voltage range is 4V to 6.5V for

the battery charger and 2.7V to 5.5V for the linear

regulator, making it ideal for applications operating

with single-cell lithium-ion/polymer batteries.

The battery charger is a complete constant cur-

rent/constant voltage linear charger. It offers an

integrated pass device, reverse blocking protec-

tion, high accuracy current and voltage regulation,

charge status, and charge termination. The charg-

ing current is programmable via external resistor

from 15mA to 500mA. In addition to these stan-

dard features, the device offers over-voltage, cur-

rent limit, and thermal protection.

The linear regulator is designed for fast transient

response and good power supply ripple rejection.

Capable of up to 300mA load current, it includes

short-circuit protection and thermal shutdown.

The AAT2557 is available in a Pb-free, thermally-

enhanced TSOPJW-14 package and is rated over

the -40擄C to +85擄C temperature range.

Features

鈥?/div>

SystemPower

鈩?/div>

鈥?/div>

Battery Charger:

鈥?Input Voltage Range: 4V to 6.5V

鈥?Programmable Charging Current up to

500mA

鈥?Highly Integrated Battery Charger

鈥?Charging Device

鈥?Reverse Blocking Diode

Linear Regulator:

鈥?300mA Output Current

鈥?Low Dropout: 400mV at 300mA

鈥?Fast Line and Load Transient Response

鈥?High Accuracy: 鹵1.5%

鈥?70碌A(chǔ) Quiescent Current

Short-Circuit, Over-Temperature, and Current

Limit Protection

TSOPJW-14 Package

-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Bluetooth

廬

Headsets

Cellular and DECT Phones

Handheld Instruments

MP3 and Portable Music Players

PDAs and Handheld Computers

Portable Media Players

Typical Application

Adapter/USB Input

ADP

STAT

INLDO

C

INLDO

Charger Enable

LDO Enable

V

OUTLDO

EN_BAT

System

AAT2557

ENLDO

OUTLDO

C

OUTLDO

BYP

C

BYP

GND

ISET

BAT

BATT+

C

BAT

BATT-

R

SET

Battery

Pack

2557.2007.06.1.0

1

型號

版本

描述

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