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Total Power Solution for Portable Applications

General Description

The AAT2554 is a fully integrated 500mA battery

charger, a 250mA step-down converter, 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 step-down con-

verter and 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 step-down converter is a highly integrated

converter operating at a 1.5MHz switching fre-

quency, minimizing the size of external compo-

nents while keeping switching losses low. It has

independent input and enable pins. The output

voltage ranges from 0.6V to the input voltage.

The AAT2554 linear regulator is designed for fast

transient response and good power supply ripple

rejection. Designed for 300mA of load current,

it includes short-circuit protection and thermal

shutdown.

The AAT2554 is available in a Pb-free, thermally-

enhanced TDFN34-16 package and is rated over

the -40擄C to +85擄C temperature range.

AAT2554

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

Step-Down Converter:

鈥?Input Voltage Range: 2.7V to 5.5V

鈥?Output Voltage Range: 0.6V to V

IN

鈥?250mA Output Current

鈥?Up to 96% Efficiency

鈥?30碌A Quiescent Current

鈥?1.5MHz Switching Frequency

鈥?100碌s Start-Up Time

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 Quiescent Current

Short-Circuit, Over-Temperature, and Current

Limit Protection

TDFN34-16 Package

-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Bluetooth

廬

Headsets

Cellular Phones

Handheld Instruments

MP3 and Portable Music Players

PDAs and Handheld Computers

Portable Media Players

Typical Application

Adapter/USB Input

Enable

V

OUTB

R

FB1

C

OUTB

R

FB2

V

OUTA

C

OUTA

FB

OUTA

GND

ISET

L= 3.0碌H

LX

ADP

STAT

EN_BAT

VINB

ENB

VINA

ENA

AAT2554

BAT

System

BATT+

C

OUT

R

SET

BATT-

Battery

Pack

2554.2007.01.1.2

1

型號

版本

描述

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