MP1584
3A, 1.5MHz, 28V
Step-Down
Converter
MP1584 Rev. 1.0
www.MonolithicPower.com
1
8/8/2011
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP1584 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
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 1.5MHz, the MP1584 is able to
prevent EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MP1584 is available in a thermally enhanced
SOIC8E package.
FEATURES
Wide 4.5V to 28V Operating Input Range
Programmable Switching Frequency from
100kHz to 1.5MHz
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
C3
220pF
C6
NS
C4
100nF
D1
V
OUT
3.3V
V
IN
VIN
EN
FREQ
GND
BST
5
8
1
4
3
7
2
6
SW
FB
COMP
MP1584
EN
OUTPUT CURRENT (A)
EFFICIENCY (%)
0
10
20
30
40
50
60
70
80
90
100
0.01
0.1
1
10
V
IN
=12V
V
IN
=24V
Efficiency Curve
(f
SW
=500kHz)