MP1586 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – 3A, 28V, 50kHz to 400kHz Step-Down Converter

The Future of Analog IC Technology
MP1586
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
• 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.
APPLICATIONS
• High Voltage Power Conversion
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
C4
100nF
8
VIN
7
VIN
BST
SW ¹
D1
EN
2
EN
FB ⁴
MP1586
6
FREQ
COMP ³
GND
5
C3
820pF
C6
NS
Efficiency vs.
Load Current
V_OUT=5V,F_SW=250kHz
100 _VIN=8V
VOUT
90
5V
80
V_IN=12V
70
V_IN=24V
60
50
40
0.01
0.1
1
10
LOAD CURRENT(A)
MP1586 Rev. 0.91
www.MonolithicPower.com
1
1/8/2010
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