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PRODUCT DATASHEET

AAT2514

SwitchReg

TM

General Description

The AAT2514 SwitchReg鈩?is a dual channel current mode

PWM DC-DC step-down converter operating at 1.5MHz

constant frequency. The device is ideal for portable equip-

ment requiring two separate power supplies that need

high current up to 600mA. The device operates from

single-cell Lithium-ion batteries while still achieving over

96% efficiency. The AAT2514 also can run at 100% duty

cycle for low dropout operation, extending battery life in

portable systems while light load operation provides very

low output ripple for noise sensitive applications.

The device has a unique adaptive slope compensation

scheme that makes it possible to operate with a lower

range of inductor values to optimize size and provide

efficient operation. The 1.5MHz switching frequency

minimizes the size of external components while keeping

switching losses low. The AAT2514 can operate from a

2.5V to 5.5V input voltage and can supply up to 600mA

output current for each channel.

The AAT2514 is available in a Pb-free 3 x 3mm 10-lead

TDFN package and operates over the -40擄C to +85擄C

temperature range.

Dual Channel 600mA Step-Down Converter

Features

鈥?/div>

V

IN

Range:2.5V to 5.5V

Up to 600mA Output Current

High Efficiency: Up to 96%

1.5MHz Constant Frequency Operation

100% Duty Cycle Dropout Operation

Low R

DS(ON)

Internal Switches: 0.35惟

Current Mode Operation for Excellent Line and Load

Transient Response

Adaptive Slope Compensation

Soft Start

Short-Circuit and Thermal Fault Protection

<1渭A Shutdown Current

Power-On Reset Output

Small, Thermally Enhanced TDFN33 -10 Package

-40擄C to +85擄C Temperature Range

Applications

鈥?/div>

Cellular Telephones

Digital Still Cameras

PDAs

Portable Media Players

Wireless and DSL Modems

Typical Application

EN1

V

IN

2.5V to 5.5V

V

OUT2

2.5V

C1

10渭F

L2 2.2渭H

EN2

IN

POR

R5

100k惟

RESET

L1 2.2渭H

V

OUT1

1.8V

AAT2514

LX 2

LX1

C3

10渭F

FB2

R4

1M惟

R3

316k惟

GND

FB1

R1

316k惟

R2

634k惟

C2

10渭F

2514.2008.02.1.1

www.analogictech.com

1

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