The Future of Analog IC Technology
36V, 1MHz, 0.6A
Step-Down Converter
With 35μA Quiescent Current
FEATURES
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MP4566
DESCRIPTION
The MP4566 is a high frequency (1MHz) step-
down switching regulator with integrated
internal high-side high voltage power MOSFET.
It provides single 0.6A (or less) highly efficient
output with current mode control for fast loop
response.
The wide 4.5V to 36V input range
accommodates a variety of step-down
applications in automotive input environment.
The very low shutdown mode 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.
Frequency fold-back helps prevent inductor
current runaway during start-up. Thermal
shutdown provides reliable, fault-tolerant
operation.
The MP4566 is available in a 2mmx3mm QFN8
package.
35μA Quiescent Current
Low Shutdown Mode Current: <2μA
Wide 4.5V to 36V Operating Input Range
450mΩ Internal Power MOSFET
Fixed 1MHz Switching Frequency
Internally compensated
Stable with Ceramic Output Capacitors
Internal Soft-Start
Precision Current Limit Without Current
Sensing Resistor
High Light Load Efficiency up to 77% at
1mA
+1.0V FB Reference Voltage
Output Adjustable from +1.0V to 0.8xV
IN
2mmx3mm QFN8 Package
Adapter-Based/Handheld Applications
Notebook/Netbook PCs
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
APPLICATIONS
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs. Load Current
C3
2
VOUT=3.3V
L1
SW
3
BST
VIN
4.5V to 36V
4
VOUT
3.3V/0.6A
C2
100
90
80
70
60
V
IN
=12V
V
IN
=24V
V
IN
=36V
1
V
IN
=6V
C1
VIN
MP4566
BIAS
EN
GND FB
6
7
1
D1
R3
C4
OFF ON
5
R1
50
40
R2
C5
39pF
30
20
0.0001 0.001
0.01
0.1
LOAD CURRENT (A)
MP4566 Rev. 1.01
9/22/2011
ww.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
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