MP4423

High Efficiency 3A, 36V,

Synchronous Step Down Converter

MP4423 Rev. 1.0

www.MonolithicPower.com

1

8/18/2014

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© 2014 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4423 is a high-frequency, synchronous,

rectified, step-down, switch-mode converter

with built-in power MOSFETs. It offers a very

compact solution to achieve a 3A continuous

output current with excellent load and line

regulation over a wide input supply range. The

MP4423 has synchronous mode operation for

higher efficiency over the output current load

range.

Current-mode operation provides fast transient

response and eases loop stabilization.

Full protection features include over-current

protection and thermal shut down.

The MP4423 requires a minimal number of

readily-available standard external components,

and is available in a space-saving QFN-8

(3mmx3mm) package.

FEATURES

• Wide 4V to 30V Continuous Operating Input

Range

• 36V Input Transient Tolerance for

Automotive Load Dump

MOSFETs

• High-Efficiency Synchronous Mode

Operation

• Default 410kHz Switching Frequency

• Synchronizes to a 200kHz to 2.2MHz

External Clock

• High Duty Cycle for Automotive Cold-crank

• Power-Save Mode

• Internal Soft-Start

• Power Good

• OCP Protection and Hiccup

• Thermal Shutdown

• Output Adjustable from 0.8V

• Available in an QFN-8 (3mmx3mm)

package

APPLICATIONS

• Automotive

• Industrial Control System

• 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

MP4423

BST

SW

FB

EN/SYNC

IN

EN/SYNC

VIN

VOUT

47 F

C2

L1

10 H

R2

R1

41.2k

13k

C1

22 F

3.3V/3A

GND

VCC

PG

C3

0.1 F

R3

51k

C4

100nF

R4

20