MP4350
2.5A, 4MHz, 20V
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP4350 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides 2.5A output with current mode control
for fast loop response and easy compensation.
The wide 4.5V to 20V input range
accommodates a variety of step-down
applications, including those in an automotive
input environment. A 100µA operational
quiescent current allows use in battery-powered
applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
The frequency foldback helps prevent inductor
current runaway during startup and thermal
shutdown provides reliable, fault tolerant
operation.
By switching at 4MHz, the MP4350 is able to
prevent switching related EMI (Electromagnetic
Interference) noise problems, such as those
found in AM radio and ADSL applications.
The MP4350 is available in a small 3mm x 3mm
10-pin QFN package.
FEATURES
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100µA Quiescent Current
Wide 4.5V to 20V Operating Input Range
150mΩ Internal Power MOSFET
Up to 4MHz Programmable Switching
Frequency
Ceramic Capacitor Stable
Internal Soft-Start
Internal Set Current Limit without a Current
Sensing Resistor
Up to 95% Efficiency
Output Adjustable from 0.8V to 16V
Available in a 10-Pin QFN (3mm x 3mm) Package
DSL Power
Set Top Boxes
Battery Powered Systems
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
C4
100nF
10
V
IN
8,9
VIN
BST
SW
1,2
D1
EN
3
EN
FB
5
V
OUT
3.3V
100
90
EFFICIENCY (%)
Efficiency vs
Load Current
V
IN
=5V
80
70
60
50
40
30
0
V
IN
=12V
MP4350
7
FREQ
GND
5
COMP
4
C3
220pF
C6
NS
V
OUT
=3.3V
0.5
1.0
1.5
2.0
LOAD CURRENT (A)
2.5
MP4350 Rev. 1.0
5/26/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
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