MP1586
The Future of Analog IC Technology
3A, 28V, 50kHz to 400kHz
Step-Down Converter
DESCRIPTION
The MP1586 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides 3A output with current mode control for
fast loop response and easy compensation.
The wide 4.5V to 28V input range accommodates
a variety of step-down applications, including
those in an automotive input environment. A
115µA 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.
The MP1586 is available in a thermally enhanced
SOIC8E package.
FEATURES
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Wide 4.5V to 28V Operating Input Range
Programmable Switching Frequency from
50kHz to 400kHz
High-Efficiency Pulse Skipping Mode for
Light Load
Ceramic Capacitor Stable
Internal Soft-Start
Internally Set Current Limit without a
Current Sensing Resistor
Available in SOIC8E Package.
High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
C4
100nF
Efficiency vs.
Load Current
100
V
IN
=8V
1
D1
V
OUT
=5V,F
SW
=250kHz
8
V
IN
7
VIN
BST
SW
V
OUT
5V
90
EFFICIENCY (%)
80
70
60
50
40
0.01
V
IN
=24V
V
IN
=12V
EN
2
EN
MP1586
FB
4
6
FREQ
GND
5
COMP
3
C3
820pF
C6
NS
0.1
1
10
LOAD CURRENT(A)
MP1586 Rev. 0.91
1/8/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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