MP4473

High-Efficiency, Fast-Transient, 3.5A, 36V

Synchronous, Step-Down Converter

MP4473 Rev. 1.0

www.MonolithicPower.com

1

12/15/2014

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2014 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4473 is a fully integrated, high-

frequency, synchronous, rectified, step-down,

switch-mode converter. It offers a compact

solution to achieve a 3.5A, continuous-output

current over a wide input-supply range with

excellent load and line regulation. It provides

fast, transient response and good stability for

wide input-supply and load range. The MP4473

operates at high efficiency over a wide-output-

current load range.

MP4473 has full protection features including,

short-circuit protection (SCP), over-current

protection (OCP), under-voltage protection

(UVP), and thermal shutdown (TSD).

The MP4473 requires minimal, readily available,

standard, external components, and is available

in a compact 3mmx4mm, 20-pin, QFN package.

FEATURES

• Wide 4.5V-to-36V Operating Input Range

• Guaranteed 3.5A, Continuous Output

Current

• Internal 40mΩ High-Side, 20mΩ Low-Side

Power MOSFETs

• Proprietary Switching-Loss-Reduction

Technology

• 1% Reference Voltage

• Programmable Soft-Start Time

• Low Drop-Out Mode

• 200kHz-to-1MHz Switching Frequency

• SCP, OCP, UVP, and Thermal Shutdown

• Available in a 3mmx4mm, 20-pin, QFN

Package

APPLICATIONS

•

Notebook Systems and I/O Power

•

Automotive Systems

•

Networking Systems

•

Industrial Supplies

•

Optical Communications Systems

•

Distributed Power and POL Systems

All MPS parts are lead-free and adhere to the RoHS directive. 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

499k

63.4k

10

1

33nF

0.1

390pF

620k

31.6k

L1

C4

R4

C3

R1

C1

R5

R3

C5

C6

8,19,21,22,23

V

V

IN

EN

9,10

3

7

11-16

1

4

6

5

2

20

,17,18,24,25

MP4473

IN

BST

SW

FB

SS

EN

PGOOD

VCC

FREQ

AGND PGND

0

10

20

30

40

50

60

70

80

90

100

0.01

0.1

1

10