MP28255 Datasheet: Step-Down Converter





MP28255 Step-Down Converter Datasheet

Part Number MP28255
Description Step-Down Converter
Manufacture MPS
Total Page 14 Pages
PDF Download Download MP28255 Datasheet PDF

Features: The Future of Analog IC Technology MP28 255 21V, 4A, 500kHz Synchronous Step-do wn Converter DESCRIPTION The MP28255 i s a high frequency synchronous rectifie d step-down switch mode converter with built in internal power MOSFETs. It off ers a very compact solution to achieve 4A continuous output current over a wid e input supply range with excellent loa d and line regulation. The MP28255 oper ates at high efficiency over a wide out put current load range. Current mode op eration provides fast transient respons e and eases loop stabilization. Full pr otection features include OCP and therm al shut down. The MP28255 requires a mi nimum number of readily available stand ard external components and is availabl e in a space saving 3mm x 4mm 14-pin QF N package. FEATURES • Wide 4.5V to 2 1V Operating Input Range • 4A Output Current • Low RDS(ON) Internal Power MOSFETs • Proprietary Switching Loss Reduction Technique • Fixed 500kHz Sw itching Frequency • External Soft-Start • Sync from 300kHz to 2MHz Extern.

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The Future of Analog IC Technology
MP28255
21V, 4A, 500kHz
Synchronous Step-down Converter
DESCRIPTION
The MP28255 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a
very compact solution to achieve 4A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP28255 operates at high efficiency over a
wide 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 MP28255 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
FEATURES
Wide 4.5V to 21V Operating Input Range
4A Output Current
Low RDS(ON) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Fixed 500kHz Switching Frequency
External Soft-Start
Sync from 300kHz to 2MHz External Clock
Internal Compensation
Integrated Bootstrap Diode
Over-Current Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in 14-pin QFN3x4 Package
APPLICATIONS
Networking Systems
Digital Set Top Boxes
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
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.
The information in this datasheet about the product and its associated
technologies are proprietary and intellectual property of Monolithic Power
Systems and are protected by copyright and pending patent applications
TYPICAL APPLICATION
4.5V-21V
VIN
PG
ON/OFF
1 IN
BST 6
C1
22uF
9 PG
R3
100K11 VCC
C3
0.1uF
MP28255
7 EN/SYNC
C4
0.1uF
SW 2,3,4,5
L1
2uH
FB 8
SS 10
Rt
24K
C5
47nF
GND AGND
12,13 14
R1
4.99K
R2
10K
C2
47uF
1.2V/4A
MP28255 Rev. 1.02
www.MonolithicPower.com
9/16/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
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