AAT1120

500mA Step-Down Converter

DATA SHEET

1

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201973B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

General Description

The AAT1120 SwitchReg is a 1.5MHz step-down con-

verter 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 current. The

1.5MHz switching frequency minimizes the size of exter-

nal components, while keeping switching losses low. The

AAT1120 feedback and control delivers excellent load

regulation and transient 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.

Features

• 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

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Micro Hard Disk Drive

• Portable Music Players

• USB Devices

Typical Application

3.0μH

L1

118kΩ

59kΩ

4.7µF

4.7µF

EN

FB

VP

VIN

LX

PGND

GND

AAT1120

500mA