MP4558
1A, 2MHz, 55V
Step-Down Converter
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
MP4558 Rev. 1.01
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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