MP4458

1A, 4MHz, 36V

Step-Down Converter

MP4458 Rev. 1.02

www.MonolithicPower.com

1

3/4/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4458 is a high frequency step-down

switching regulator with an integrated internal

high-side high voltage power MOSFET. It

provides 1 A output with current mode control

for fast loop response and easy compensation.

The

wide

3.8V

to

36V

input

range

accommodates

a

variety

of

step-down

applications, including those in automotive

systems. A 120µA operational quiescent current

is

suitable

for

use

in

battery-powered

applications.

The frequency foldback helps prevent inductor

current runaway during startup and thermal

shutdown

provides

reliable,

fault

tolerant

operation.

In some applications, such as AM radio and

ADSL applications, in which the device is

sensitive to frequency band, the MP4458 can

avoid the related EMI problem by setting the

frequency at 4MHz.

The MP4458 is available in thin 10-pin 3mm x 3mm

TQFN package.

FEATURES

• 120μA Quiescent Current

• Wide 3.8V to 36V Operating Input Range

• 300mΩ Internal Power MOSFET

• Up to 4MHz Programmable Switching

Frequency

• Ceramic Capacitor Stable

• Internal Soft-Start

• Precision Current Limit without a Current

Sensing Resistor

• Up to 95% Efficiency

• Output Adjustable from 0.8V to 30V

• Available in 10-Pin 3x3mm TQFN Package

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 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

MP4458

COMP

FB

FREQ

EN

4

5

7

3

VIN

GND

SW

BST

8, 9

6

1, 2

10

5V @ 1A

36V max

CONTROL

C6

NS

10MQ100N

C4

100nF

100

90

80

70

60

50

40

30

20

0

500

1000

LOAD CURRENT (mA)

Efficiency vs

Load Current