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PRODUCT DATASHEET

AAT2785

SystemPower

TM

General Description

The AAT2785 is a 3-channel 1.8MHz step-down con-

verter for applications where power efficiency and solu-

tion size are critical. The input voltage range is 2.7V to

5.5V and the outputs are adjustable from 0.6V to V

IN

.

The AAT2785 incorporates a unique low noise architec-

ture which reduces ripple and spectral noise. Channel 3

delivers up to 1.5A output current and channels 1 and 2

deliver up to 600mA each. The AAT2785 uses a high

switching frequency to minimize the size of external com-

ponents. The AAT2785 requires a minimum of external

components to realize a high efficiency triple-output buck

converter minimizing solution cost and PCB footprint.

Each of the 3 regulators has an independent enable pin,

adjustable output voltage and operates with low no load

quiescent current, providing high efficiency over the

entire load range.

The AAT2785 is available in a Pb-free 16 pin TDFN34

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

temperature range.

3-Channel Step-Down DC/DC Converter

Features

鈥?V

IN

Range: 2.7 to 5.5V

鈥?Output Voltage Range: 0.6V to V

IN

鈥?Output Current:

鈻?/div>

Channel 3: 1.5A

鈻?/div>

Channel 1: 600mA

鈻?/div>

Channel 2: 600mA

鈥?Low Noise Light Load Mode

鈥?Low Ripple PWM Mode

鈥?Highly Efficient Step-Down Converters

鈥?Low R

DS(ON)

Integrated Power Switches

鈥?100% Duty Cycle

鈥?1.8MHz Switching Frequency

鈥?Internal Soft Start

鈥?Fast 150渭s Turn-On Time

鈥?Over-Temperature Protection

鈥?Current Limit Protection

鈥?TDFN34-16 Package

鈥?-40擄C to 85擄C Temperature Range

Applications

鈥?/div>

Cellular and Smart Phones

Digital Cameras

Handheld Instruments

Mass Storage Systems

Microprocessor / DSP Core / IO Power

PDAs and Handheld Computers

Portable Media Players

USB Devices

Wireless LAN

Typical Application

IN

LX1

L1

4.7渭H

V

OUT1

: 3.3V, 600mA

R1

133k

AAT2785

FB1

V

IN

: 2.7V鈥?.5V

VP1_2

EN1

LX2

FB2

C1

10渭F

EN2

PGND

L3

1.5渭H

VP3

EN3

FB3

C2

10渭F

GND

PGND

LX3

L2

4.7渭H

V

OUT2

: 3.3V, 600mA

R3

133k

R4

29.4k

C4

4.7渭F

R2

29.4k

C3

4.7渭F

V

OUT3

: 1.2V, 1.5A

R5

59.0k

R6

59.0k

C5

10渭F

2785.2008.01.1.0

www.analogictech.com

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AAT2785 Datasheet

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