MP4473
High-Efficiency, Fast-Transient, 3.5A, 36V
Synchronous, Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
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.
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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
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Programmable Soft-Start Time
Low Drop-Out Mode
MP4473 has full protection features including,
short-circuit protection (SCP), over-current
protection (OCP), under-voltage protection
(UVP), and thermal shutdown (TSD).
200kHz-to-1MHz Switching Frequency
SCP, OCP, UVP, and Thermal Shutdown
Output Adjustable from 0.8V to 0.9×VIN
Available in a 3mmx4mm, 20-pin, QFN
Package
The MP4473 requires minimal, readily available,
standard, external components, and is available
in a compact 3mmx4mm, 20-pin, QFN package.
APPLICATIONS
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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
8,19,21,22,23
100
90
7
VIN
IN
BST
C3
0.1
C1
10
V
OUT 3.3V
L1
MP4473
80
70
60
50
40
30
20
2
SW
FREQ
VCC
9,10,17,18,24,25
C4
R4
20
R5
499k
R3
63.4k
R1
31.6k
C5
1
620k
390pF
6
5
PGOOD
EN
3
EN
FB
SS
4
PGND
AGND
1
11-16
C6
33nF
10
0
0.01
0.1
1
10
MP4473 Rev. 1.0
12/15/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
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