MP1584 Datasheet, PDF (1/17 Pages) Monolithic Power Systems – 3A, 1.5MHz, 28V Step-Down Converter

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.
TYPICAL APPLICATION
C4
100nF
8
VIN
7 _VIN
BST
SW ¹
EN
2 _EN
FB ⁴
MP1584
6 _FREQ
COMP ³
GND
5
D1
C3
220pF
C6
NS
MP1584
3A, 1.5MHz, 28V
Step-Down Converter
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.
VOUT
3.3V
Efficiency Curve
(f_SW=500kHz)
100
90
V_IN=12V
80
70
60
V_IN=24V
50
40
30
20
10
0
0.01
0.1
1
10
OUTPUT CURRENT (A)
MP1584 Rev. 1.0
www.MonolithicPower.com
1
8/8/2011
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