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AAT1123

1MHz Step-Down Converter

Skyworks Solutions 

General Description

The AAT1123 SwitchReg™ is a member of Skyworks'

Total Power Management IC (TPMIC™) product family. It

is a 1MHz 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 AAT1123 the ideal choice for portable applica-

tions.

The AAT1123 is available in either a fixed version with

internal feedback or a programmable version with exter-

nal feedback resistors. It can deliver up to 600mA of load

current while maintaining a low 25μA no load quiescent

current. The 1MHz switching frequency minimizes the

size of external components while keeping switching

losses low. The AAT1123 feedback and control delivers

excellent load regulation and transient response with a

small output inductor and capacitor.

The AAT1123 is designed to maintain high efficiency

throughout the operating range and provides fast turn-

on time.

The AAT1123 is available in a space-saving 2.0 x 2.2mm

SC70JW-8 package and is rated over the -40°C to +85°C

temperature range.

DATA SHEET

AAT1123

1MHz Step-Down Converter

Features

• VIN Range: 2.7V to 5.5V

• VOUT Adjustable Down to 0.6V

▪ Fixed or Adjustable Version

• Fast Turn-On Time (100μs Typical)

• 25μA No Load Quiescent Current

• Up to 97% Efficiency

• Output Current Up to 600mA

• 1MHz Switching Frequency

• Soft Start

• Over-Temperature Protection

• Current Limit Protection

• 100% Duty Cycle Low-Dropout Operation

• 0.1μA Shutdown Current

• SC70JW-8 Package

• Temperature Range: -40°C to +85°C

Applications

• Cellular Phones

• Digital Cameras

• Handheld Instruments

• Microprocessor / DSP Core / IO Power

• PDAs and Handheld Computers

• USB Devices

Typical Application (Fixed Output Voltage)

VIN

C2

4.7μF

U1

AAT1123

3 VIN

LX 4

1 EN

OUT 2

5 AGND PGND 7

8 PGND PGND 6

L1

4.7μH

VO

C1

22μF

AAT1123 Efficiency

(VOUT = 2.5V; L = 10μH)

100

90

VIN = 3.3V

80

70

60

0.1

1

10

100

1000

Output Current (mA)

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

201975B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

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