AAT1120 Просмотр технического описания (PDF) - Advanced Analogic Technologies

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AAT1120

500mA Step-Down Converter

Advanced Analogic Technologies 

General Description

The AAT1120 SwitchReg is a 1.5MHz step-down

converter with an input voltage range of 2.7V to

5.5V and output as low as 0.6V. Its low supply

current, small size, and high switching frequency

make the AAT1120 the ideal choice for portable

applications.

The AAT1120 delivers up to 500mA of load current,

while maintaining a low 30μA no load quiescent cur-

rent. The 1.5MHz switching frequency minimizes

the size of external components, while keeping

switching losses low. The AAT1120 feedback and

control delivers excellent load regulation and tran-

sient response with a small output inductor and

capacitor.

The AAT1120 is available in a Pb-free, 8-pin, 2x2mm

STDFN package and is rated over the -40°C to

+85°C temperature range.

Typical Application

AAT1120

500mA Step-Down Converter

Features

SwitchReg™

• VIN Range: 2.7V to 5.5V

• VOUT Range: 0.6V to VIN

• Up to 500mA Output Current

• Up to 96% Efficiency

• 30μA Typical Quiescent Current

• 1.5MHz Switching Frequency

• Soft-Start Control

• Over-Temperature and Current Limit

Protection

• 100% Duty Cycle Low-Dropout Operation

• <1μA Shutdown Current

• Small External Components

• Ultra-Small STDFN22-8 Package

• Temperature Range: -40°C to +85°C

Applications

• Bluetooth® Headsets

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Micro Hard Disk Drive

• Portable Music Players

• USB Devices

VIN

C1

4.7µF

AAT1120

VP

LX

VIN

EN

FB

GND PGND

VO = 1.8V

L1

3.0μH

R1

118kΩ

500mA

R2

59kΩ

C2

4.7µF

1120.2007.01.1.0

1

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