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AAT2158

1.5A Low Noise Step-Down Converter

General Description

The AAT2158 SwitchReg is a 1.5A step-down con-

verter with an input voltage range of 2.4V to 5.5V

and an adjustable output voltage from 0.6V to V

IN

.

The 1.4MHz switching frequency enables the use

of small external components. 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碌A(chǔ) 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 com-

ponents 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 system components from damage.

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

ing 16-pin 3x3mm QFN package. The product is

rated over an operating temperature range of -40擄C

to +85擄C.

Features

鈥?/div>

SwitchReg

鈩?/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碌A(chǔ) 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碌A(chǔ) 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

2158.2007.10.1.1

1

型號(hào)

版本

描述

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AAT2158 Datasheet

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