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PRODUCT DATASHEET

AAT2158

SwitchReg

TM

General Description

The AAT2158 SwitchReg is a 1.5A step-down converter

with an input voltage range of 2.4V to 5.5V and an adjust-

able output voltage from 0.6V to V

IN

. The 1.4MHz switch-

ing frequency enables the use of small external compo-

nents. The small footprint and high efficiency make the

AAT2158 an ideal choice for portable applications.

The AAT2158 delivers 1.5A maximum output current

while consuming only 42渭A of no-load quiescent current.

Ultra-low R

DS(ON)

integrated MOSFETs and 100% duty

cycle operation make the AAT2158 an ideal choice for

high output voltage, high current applications which

require a low dropout threshold.

The AAT2158 provides excellent transient response and

high output accuracy across the operating range. No

external compensation components are required.

The AAT2158 maintains high efficiency throughout the

load range. The AAT2158鈥檚 unique architecture produces

reduced ripple and spectral noise. Over-temperature and

short-circuit protection safeguard the AAT2158 and sys-

tem components from damage.

The AAT2158 is available in a Pb-free, space-saving

16-pin 3x3mm QFN package. The product is rated over

an operating temperature range of -40擄C to +85擄C.

1.5A Low Noise Step-Down Converter

Features

鈥?/div>

1.5A Maximum Output Current

Input Voltage: 2.4V to 5.5V

Output Voltage: 0.6V to V

IN

Up to 95% Efficiency

Low Noise Light Load Mode

42渭A No Load Quiescent Current

No External Compensation Required

1.4MHz Switching Frequency

100% Duty Cycle Low-Dropout Operation

Internal Soft Start

Over-Temperature and Current Limit Protection

<1渭A Shutdown Current

16-Pin 3x3mm QFN Package

Temperature Range: -40擄C to +85擄C

Applications

鈥?/div>

Cellular Phones

Digital Cameras

Hard Disk Drives

MP3 Players

PDAs and Handheld Computers

Portable Media Players

USB Devices

Typical Application

3.3V

12

11

10

U1

AAT2158

VP

EN

VCC

N/C

FB

LX

N/C

PGND

4

15

14

13

16

3

2

1

2.5V

R3

187k

L1

2.2碌H

C1

10碌F

7

9

6

8

5

R4

59k

C3

22碌F

SGND PGND

2158.2008.02.1.2

www.analogictech.com

1

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