MP2249

1MHz, 6V, 3A, Low-Voltage

Synchronous Step-Down Converter

MP2249 Rev.1.0

www.MonolithicPower.com

1

11/2/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2249 is a 1MHz constant frequency,

current mode, PWM step-down converter. The

device integrates a main switch and a

synchronous rectifier for high efficiency and

eliminates the need for an external Schottky

diode. It is ideal for powering portable

equipment that runs from a single cell Lithium-

Ion (Li+) battery.

The MP2249 can supply 3A of load current from

a 2.5V to 6V input voltage. It can run at 100%

duty cycle for low dropout applications. The

MP2249 provides internal soft-start control to

reduce rush current and output discharge

function to control discharging of the output

capacitor.

The MP2249 is available in small 3mmx3mm

TQFN10 or SOIC8E package.

FEATURES

• High Efficiency: Up to 90%

• Power Save Mode at Light Load

• 1MHz Constant Switching Frequency

• Up to 4.5A Peak Current

• 2.5V to 6V Input Voltage Range

• Output Adjustable from 0.6V to VIN

• 100% Duty Cycle in Dropout

• Output Discharge Function

• Internal Soft-Start Control

• Power Good Indicator

•

Short Circuit Protection

• Thermal Fault Protection

• Available in 3mmx3mm TQFN10 or SOIC8E

Package

APPLICATIONS

• Cellular and Smart Phones

• Microprocessors and DSP Core Supplies

• PDAs

• MP3 Players

• Digital Still and Video Cameras

• Portable Instruments

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

EN

GND

MP2249

PVIN

FB

SW

L1

2.2 H

R1

C2

R2

ON OFF

PG

R3

PVIN

PG

C1

10

10

C3

22

C4