MP28256 Datasheet: Step-Down Converter





MP28256 Step-Down Converter Datasheet

Part Number MP28256
Description Step-Down Converter
Manufacture MPS
Total Page 13 Pages
PDF Download Download MP28256 Datasheet PDF

Features: The Future of Analog IC Technology DESCR IPTION The MP28256 is a synchronous rec tified stepdown switch mode converter w ith built in internal power MOSFETs. It offers a very compact solution to achi eve 3A continuous output current over a wide input supply range with excellent load and line regulation. The MP28256 has synchronous mode operation for high er 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 r eadily available standard external comp onents and is available in a space savi ng QFN14 (3x4mm) package. TYPICAL APPLI CATION EFFICIENCY (%) MP28256 21V, 3A 500kHz Synchronous Step-Down Converter FEATURES • Wide 4.5V to 21V Operatin g Input Range • 0.6V internal referen ce with 2% accuracy • 3A Output Curre nt • Low Rds(ON) Internal Power MOSFE Ts • Fixed 500kHz Switching Frequency • Frequency SYNC from 300kHz to 2.

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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.
TYPICAL APPLICATION
MP28256
21V, 3A 500kHz Synchronous
Step-Down Converter
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
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.
Efficiency vs. Load Current
VOUT=1.2V
100
90
80
70 VIN=4.5V
60
50 VIN=12V
40
30 VIN=21V
20
10
0
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
MP28256 Rev. 1.01
www.MonolithicPower.com
9/2/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
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