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AAT2503

Adjustable 3-Channel Regulator

General Description

The AAT2503 is a three-channel regulator consist-

ing 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 optimizes power efficien-

cy throughout the load range. Pulling the MODE/

SYNC pin high enables "PWM Only" mode, main-

taining constant frequency and low output ripple

across the operating range. Alternatively, the con-

verter may be synchronized to an external clock

input to the MODE/SYNC pin. The step-down con-

verter delivers up to 800mA of output current, while

consuming 30碌A(chǔ) of typical no load quiescent cur-

rent. The switching frequency is 2MHz, minimizing

the size of external components.

The two LDOs (LDOA/LDOB) have independent

inputs and are capable of delivering up to 150mA

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

open drain output signal when LDOA is within reg-

ulation. Both LDOs feature low quiescent current

and a low dropout voltage. The output voltages for

both LDOs are adjustable to as low as 0.6V. The

linear regulators have independent Enable pins.

The AAT2503 is available in a Pb-free 3x4mm

QFN34-20 package and is rated over the -40擄C to

+85擄C temperature range.

Features

鈥?/div>

SystemPower

鈩?/div>

鈥?/div>

800mA Step-Down Converter

鈥?V

IN

Range: 2.7V to 5.5V

鈥?V

OUT

Range: 0.9V to V

IN

鈥?High Efficiency

鈥?2MHz Switching Frequency

Two 150mA Low Dropout Regulators

鈥?V

OUT

Range: 0.6V to V

IN

鈥?High Output Accuracy: 鹵1.5%

85碌A(chǔ) of Total I

Q

Independent Enable Pins

Integrated Power MOSFETs

Over-Temperature and Current Limit

Protection

QFN34-20 Package

-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

L1

LX

AAT2503

V

IN

VIN

VLDOA

VLDOB

VP

MODE/SYNC

ENA

ENB

EN

V

OUT

(Buck)

FB

OUTA

R

3

100k惟

POK

FBA

OUTB

POK

R

1

R

4

OUTA

C2

10渭F

R

5

FBB

R

8

PGND

AGND

C6

2.2渭F

R

7

C5

2.2渭F

R

2

2503.2007.04.1.1

1

型號(hào)

版本

描述

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