MP9473

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

Synchronous, Step-Down Converter

MP9473 Rev. 1.1

www.MonolithicPower.com

1

8/1/2016

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

© 2016 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP9473 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 MP9473

operates at high efficiency over a wide-output-

current load range.

MP9473 has full protection features including,

short-circuit protection (SCP), over-current

protection (OCP), under-voltage protection

(UVP), and thermal shutdown (TSD).

The MP9473 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, halogen 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

499kΩ

63.4kΩ

10μF

1μF

33nF

0.1μF

5.6μH

390pF

620kΩ

R2

10kΩ

31.6kΩ

C2

2x22μF

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

MP9473

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