MP4566

36V, 1MHz, 0.6A

Step-Down Converter

With 35μA Quiescent Current

MP4566 Rev. 1.01

ww.MonolithicPower.com

1

9/22/2011

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© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

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.

FEATURES

• 35μA Quiescent Current

• 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

• 2mmx3mm QFN8 Package

APPLICATIONS

• Adapter-Based/Handheld Applications

• Notebook/Netbook PCs

• Automotive Systems

• Industrial Power Systems

• Distributed Power Systems

• Battery Powered Systems

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

MP4566

R1

GND FB

SW

VIN

C1

EN

VIN

4.5V to 36V

VOUT

3.3V/0.6A

OFF ON

BIAS

BST

C2

R2

R3

C4

C3

L1

D1

C5

39pF

1

2

3

4

5

6

7

Efficiency vs. Load Current

VOUT=3.3V

20

30

40

50

60

70

80

90

100

0.0001 0.001

0.01

0.1

1

LOAD CURRENT (A)