MP4558

1A, 2MHz, 55V

Step-Down Converter

MP4558 Rev. 1.01

www.MonolithicPower.com

1

10/28/2013

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© 2013 MPS. All Rights Reserved.

DESCRIPTION

The MP4558 is a high-frequency, step-down

switching regulator with an integrated internal

high-side

high-voltage

power

MOSFET.

It

provides up to a 1A output with current-mode

control

for

fast

loop

response

and

easy

compensation.

The wide 3.8V-to-55V input range accommodates

a variety of step-down applications, including

automotive input. A 12µA shutdown-mode supply

current makes it suitable for battery-powered

applications.

A scaled-down switching frequency in light-load

conditions

provides

high

power-conversion

efficiency over a wide load range while reducing

switching and gate driver losses.

The frequency fold-back prevents inductor current

runaway during startup and thermal shutdown

provides reliable, fault-tolerant operation.

By switching at 2MHz, the MP4558 can prevent

EMI

(electromagnetic

interference)

noise

problems, such as those found in AM radio and

ADSL applications.

The MP4558 is available in an SOIC8E and a 10-

pin 3mm x 3mm QFN package.

FEATURES

 Wide 3.8V-to-55V Operating Input Range

 250mΩ Internal Power MOSFET

 Up to 2MHz Programmable Switching

Frequency

 140μA Quiescent Current

 Stable with Ceramic Capacitors

 Internal Soft-Start

 Up to 95% Efficiency

 Output Adjustable from 0.8V to 52V

 Available in SOIC8E and 3mm x 3mm

QFN10 Packages

APPLICATIONS

 High-Voltage Power Conversion

 Automotive Systems

 Industrial Power Systems

 Distributed Power Systems

 Battery Powered Systems

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

status, please visit the MPS website under Products, Quality Assurance

page.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION