MP1484
3A, 18V, 340KHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP1484 is a monolithic synchronous buck
regulator. The device integrates top and bottom
85mΩ MOSFETS that provide 3A of continuous
load current over a wide operating input voltage
of 4.75V to 18V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on and in shutdown mode, the supply
current drops below 1µA.
The MP1484 is PIN compatible to the MP1482
2A/18V/Synchronous Step-Down Converter.
FEATURES
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3A Continuous Output Current
Wide 4.75V to 18V Operating Input Range
Integrated 85mΩ Power MOSFET Switches
Output Adjustable from 0.925V to 15V
Up to 95% Efficiency
Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 340KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Thermally Enhanced 8-Pin SOIC Package
LCD TV
Green Electronics/Appliances
Notebook Computers
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV1484EN-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 18V
C5
10nF
100
95
2
7
IN
EN
1
BS
SW
Efficiency vs
Load Current
V
IN
= 5V
V
IN
= 12V
90
EFFICIENCY (%)
3
8
MP1484
SS
GND
4
FB
COMP
6
OUTPUT
3.3V
3A
85
80
75
70
65
60
55
50
0.1
1.0
LOAD CURRENT (A)
10
5
C3
3.9nF
MP1484 Rev. 0.1
12/14/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
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