MP28256 Datasheet, PDF (1/13 Pages) Monolithic Power Systems – 21V, 3A 500kHz Synchronous Step-Down Coverter

The Future of Analog IC Technology
DESCRIPTION
The MP28256 is a synchronous rectified step-
down switch mode converter with built in
internal power MOSFETs. It offers a very
compact solution to achieve 3A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP28256 has synchronous mode operation for
higher efficiency over output current load range.
Current mode operation provides fast transient
response and eases loop stabilization. Full
protection features include OCP and thermal
shut down.
The MP28256 requires a minimum number of
readily available standard external components
and is available in a space saving QFN14
(3x4mm) package.
MP28256
21V, 3A 500kHz Synchronous
Step-Down Coverter
FEATURES
 Wide 4.5V to 21V Operating Input Range
 0.6V internal reference with 2% accuracy
 3A Output Current
 Low Rds(ON) Internal Power MOSFETs
 Fixed 500kHz Switching Frequency
 Frequency SYNC from 300kHz to 2MHz
External Clock
 External Soft Start
 OCP and Thermal Shutdown
 Separate EN and SYNC pins
 Available in a QFN14 (3x4mm) Package.
APPLICATIONS
 DSL Modems
 Cable Modems
 Set Top Boxes
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Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs. Load Current
V_OUT=1.2V
100
90
80
70
V_IN=4.5V
60
50
V_IN=12V
40
30 V_IN=21V
20
10
0
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
MP28256 Rev. 1.0
www.MonolithicPower.com
1
11/3/2011
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