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PRODUCT DATASHEET

AAT2500B

SystemPower

TM

General Description

The AAT2500B is a three-channel regulator consisting of

a step-down converter with an input voltage range of 2.7V

to 5.5V plus two low dropout (LDO) linear regulators.

The step-down converter delivers up to 800mA of output

current, while consuming 30渭A of typical no load quies-

cent current. The switching frequency is 2MHz, minimiz-

ing the size of external components.

The two LDOs (LDOA/LDOB) have independent inputs

and are capable of delivering up to 500mA and 150mA

respectively. A Power-OK (POK) function provides an

open drain output signal when LDOA is within regulation.

Both LDOs feature low quiescent current and a low drop-

out voltage. The output voltages for both LDOs are

adjustable to as low as 0.6V. The linear regulators have

independent Enable pins.

The AAT2500B is available in a Pb-free 3x4mm QFN34-20

package and is rated over the -40擄C to +85擄C tempera-

ture range.

Adjustable 3-Channel Regulator

Features

鈥?V

IN

Range: 2.7V to 5.5V

鈥?800mA Buck Converter

鈥?Linear Regulators

鈻?/div>

LDOA: 500mA

鈻?/div>

LDOB: 150mA

鈥?Adjustable Output Voltage

鈥?Low Dropout Voltage

鈥?High Output Accuracy: 鹵1.5%

鈥?High Efficiency Step-Down Converter

鈥?85渭A (Typical) of Total I

Q

鈥?Independent Enable Pins

鈥?Integrated Power MOSFETs

鈥?2MHz Switching Frequency

鈥?Over-Temperature and Current Limit Protection

鈥?QFN34-20 Package

鈥?-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Cellular Phones

Digital Cameras

Handheld Instruments

Microprocessor/DSP Core/IO Power

PDAs and Handheld Computers

Typical Application

L

LX

AAT2500B

FB

V

IN

VIN

VLDOA

VLDOB

VP

SYNC

ENA

ENB

EN

PGND

AGND

OUTA

100k惟

POK

FBA

OUTB

POK

V

OUT

(Buck)

R

1

R

1A

OUTA

C

OUT

R

1B

FBB

R

2A

2.2渭F

R

2

R

2B

2500B.2008.03.1.0

www.analogictech.com

1

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