MP4458
1A, 4MHz, 36V
Step-Down Converter
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
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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
High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
APPLICATIONS
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
Efficiency vs
Load Current
100
90
4
8, 9
V
I
=5V
CONTROL
C6
NS
EFFICIENCY (%)
COMP
VIN
V
IN
36V max
C4
100nF
10MQ100N
V
OUT
5V @ 1A
80
70
60
50
40
30
20
0
V
I
=12V
V
I
=24V
3
EN
BST
10
7
MP4458
FREQ
SW
1, 2
5
FB
GND
6
V
O
=3.3V
500
LOAD CURRENT (mA)
1000
MP4458 Rev. 1.02
3/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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