MPQ4558

1A, 2MHz, 55V

Step-Down Converter

AEC-Q100 Qualified

MPQ4558 Rev. 1.01

www.MonolithicPower.com

1

5/17/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MPQ4558 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 MPQ4558 can prevent

EMI

(electromagnetic

interference)

noise

problems, such as those found in AM radio and

ADSL applications.

The MPQ4558 is available in an SOIC8E and a

10-pin 3mm x 3mm QFN package.

FEATURES

• Guaranteed Industrial/Automotive

Temperature Range Limits

• 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

• Available in AEC-Q100 Grade 1

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

MPQ4558

COMP

FB

FREQ

EN

VIN

GND

SW

BST

3.3V @ 1A

8V to 55V

CONTROL

C1

C4

680pF

D1

C3

100nF

C2

L1

R1

127k

R2

40.2k

R3

200k

R4

24k

0

0.5

0.75

0.25

1

OUTPUT CURRENT (A)

fs=500kHz

100

90

80

70

60

50

40

30

20

10

0