MP28258

High Efficiency, Fast Transient, 3A, 4.2V-20V Input

Synchronous Step-down Converter

in QFN12 (2x3mm)

MP28258 Rev 1.14

www.MonolithicPower.com

1

9/25/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP28258 is a fully-integrated, high-

efficiency, synchronous, step-down, switch

mode converter. It offers a very compact

solution that can achieve a 3A continuous

output current over a wide input supply range

with excellent load and line regulation, and can

operate at high efficiency over a wide output-

current load range.

Constant-On-Time

(COT)

control

mode

provides fast transient response and eases loop

stabilization.

Full protection features include SCP, OCP,

OVP, UVP and, thermal shut down.

The MP28258 requires a minimal number of

readily-available standard external components.

This device is available in a space saving

2mmx3mm 12-pin QFN package.

FEATURES

• Wide 4.2V to 20V Operating Input Range

• 3A Output Current

• Proprietary Switching Loss Reduction

Technique

• Power-Good Indicator in QFN Package

• Soft Startup/Shutdown

• Programmable Switching Frequency

• SCP, OCP, UVP Protection and Thermal

Shutdown

• Optional OCP Protection: Latch-Off Mode

and Hiccup Mode.

• Output Adjustable From 0.815V To 13V

• Available in aQFN12 (2x3mm) Package

APPLICATIONS

•

Networking Systems

•

Distributed Power Systems

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

MP28258

IN

FREQ

VCC

EN

PG

GND

FB

SW

BST

C5

C1

C3

C2

VOUT

1.2V

L1

R4

R1

R2

C4

R7

VIN

4.2V - 20V

9

8

2, 10

3

7

1, 11, 12

4

5

6

EN

OFF ON