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AAT1151

850kHz 700mA Synchronous Buck DC/DC Converter

DATA SHEET

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

201991B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013

General Description

The AAT1151 SwitchReg™ is a step-down switching con-

verter ideal for applications where high efficiency is

required over the full range of output load conditions.

The 2.7V to 5.5V input voltage range makes the AAT1151

ideal for single-cell lithium-ion/polymer battery applica-

tions. Capable of more than 700mA with internal

MOSFETs, the current-mode controlled IC provides high

efficiency using synchronous rectification. Fully inte-

grated compensation simplifies system design and low-

ers external parts count.

The device operates at a fixed 850kHz switching fre-

quency and enters Pulse Frequency Modulation (PFM)

mode for light load current to maintain high efficiency

across all load conditions.

The AAT1151 is available in Pb-free MSOP-8 and QFN33-

16 packages and is rated over the -40°C to +85°C tem-

perature range.

Features

• Up to 95% Efficiency

• High Initial Accuracy ±1%

• <1μA Shutdown Current

• 850kHz Switching Frequency

• Integrated Power Switches

• Synchronous Rectification

• Current Mode Operation

• Internal Compensation

• Stable with Ceramic Capacitors

• PFM for Optimum Efficiency for All Load Conditions

• Internal Soft Start

• Over-Temperature Protection

• Current Limit Protection

• MSOP-8 and QFN33-16 Packages

• -40°C to +85°C Temperature Range

Applications

• Cellular Phones

• Digital Cameras

• MP3 Players

• Notebook Computers

• PDAs

• USB-Powered Equipment

• Wireless Notebook Adapters

Typical Application

OUTPUT

3.0

μH

2x 22

μF

10

μF

0.1

μF

100

Ω

LX

VP

INPUT

FB

SGND

AAT1151

ENABLE

VCC

PGND