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AAT2513

Dual 600mA Step-Down

Converter with Synchronization

General Description

The AAT2513 is a high efficiency dual synchronous

step-down converter for applications where power

efficiency, thermal performance and solution size

are critical. Input voltage ranges from 2.7V to 5.5V,

making it ideal for systems powered by single-cell

lithium-ion/polymer batteries.

Each converter is capable of 600mA output current

and has its own enable pin. Efficiency of the con-

verters is optimized over full load range. Total no

load quiescent current is 60碌A(chǔ), allowing high effi-

ciency even under light load conditions.

The integrated power switches are controlled by

pulse width modulation (PWM) with a 1.7MHz typi-

cal switching frequency at full load, which minimizes

the size of external components. Fixed frequency,

low noise operation can be forced by a logic signal

on the MODE pin. Furthermore, an external clock

can be used to synchronize the switching frequency

of both converters.

A phase shift pin (PS) is available to operate the

two converters 180擄 out of phase at heavy load to

achieve low input ripple.

The AAT2513 is available in a Pb-free, thermally

enhanced 16-pin QFN33 package and is specified

for operation over the -40擄C to +85擄C temperature

range.

Features

鈥?/div>

SystemPower

鈩?/div>

鈥?/div>

V

IN

Range: 2.7V to 5.5V

Output Current:

鈥?Channel 1: 600mA

鈥?Channel 2: 600mA

96% Efficient Step-Down Converter

Low No Load Quiescent Current

鈥?60碌A(chǔ) Total for Both Converters

Integrated Power Switches

100% Duty Cycle

1.7MHz Switching Frequency

Optional Fixed Frequency or External SYNC

Logic Selectable 180擄 Phase Shift Between

the Two Converters

Current Limit Protection

Automatic Soft-Start

Over-Temperature Protection

QFN33-16 Package

-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Cellular Phones / Smart Phones

Digital Cameras

Handheld Instruments

Micro Hard Disc Drives

Microprocessor / DSP Core / IO Power

PDAs and Handheld Computers

Typical Application

VIN1

VIN2

VCC

FB1

L1

VOUT1

LX1

2渭H

L2

LX2

2渭H

MODE/SYNC

PS

EN1

EN2

AGND

PGND1 PGND2

FB2

R4

R3

C1

4.7渭F

Input:

2.7V to 5.5V

C

IN

1渭F

R1

VOUT2

AAT2513

R2

C2

4.7渭F

2513.2007.04.1.1

1

型號(hào)

版本

描述

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