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AAT1106

600mA Step-Down Converter

Skyworks Solutions 

General Description

The AAT1106 is a 1.5MHz constant frequency current

mode PWM step-down SwitchReg™ converter with a

unique adaptive slope compensation scheme allowing

the device to operate with a lower range of inductor val-

ues to optimize size and provide efficient operation. It is

ideal for portable equipment powered by single-cell

Lithium-ion batteries and is optimized for high efficiency,

achieving levels up to 96%.

The AAT1106 can supply up to 600mA load current from

a 2.5V to 5.5V input voltage and the output voltage can

be regulated as low as 0.6V. The device also can run at

100% duty cycle for low dropout operation, extending

battery life in portable systems. In addition, light load

operation provides very low output ripple for noise sensi-

tive applications and the 1.5MHz switching frequency

minimizes the size of external components while keeping

switching losses low.

The AAT1106 is available in a Pb-free, low-profile 5-pin

TSOT23 package, and is rated over the -40°C to +85°C

temperature range.

DATA SHEET

AAT1106

600mA Step-Down Converter

Features

• VIN Range: 2.5V to 5.5V

• VOUT: Adjustable 0.6V to VIN

• Up to 600mA Output Current

• Up to 96% Efficiency

• 1.5MHz Switching Frequency

• 100% Duty Cycle Dropout Operation

• Adaptive Slope Compensated Current Mode Control

for Excellent Line and Load Transient Response

• <1μA Shutdown Current

• Short-Circuit and Thermal Fault Protection

• TSOT23-5 Package

• -40°C to +85°C Temperature Range

Applications

• Cellular Phones, Smartphones

• Digital Still Cameras

• Digital Video Cameras

• Microprocessor and DSP Core Supplies

• MP3 and Portable Media Players

• PDAs

• Wireless and DSL Modems

Typical Application

VIN

2.5V to 5.5V

C1

4.7μF

IN

LX

AAT1106

FB

EN

GND

L1

2.2μH

C2

22pF

R2

634K

R1

316K

VOUT

1.8V

C3

10μF

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

201970B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

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