MP28254 Datasheet: Step-Down Converter





MP28254 Step-Down Converter Datasheet

Part Number MP28254
Description Step-Down Converter
Manufacture MPS
Total Page 14 Pages
PDF Download Download MP28254 Datasheet PDF

Features: The Future of Analog IC Technology MP28 254 High Efficiency 4A, 21V, 500kHz Syn chronous Step down Converter DESCRIPTI ON The MP28254 is a high frequency sync hronous rectified step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solu tion to achieve 4A continuous output cu rrent over a wide input supply range wi th excellent load and line regulation. The MP28254 has synchronous mode operat ion for higher efficiency over output c urrent load range. Current mode operati on provides fast transient response and eases loop stabilization. Full protect ion features include OCP and thermal sh ut down. The MP28254 requires a minimum number of readily available standard e xternal components and is available in a space saving 3mm x 4mm 14-pin QFN pac kage. TYPICAL APPLICATION VIN 1 IN BST 6 C1 22uF C4 0.1uF C3 0.1uF 10 R3 100K VCC MP28254 SW 2, 3 4, 5 P G 9 PG FB 8 Rt 25K EN 7 EN/SYNC GN D 11, 12, 13, 14 FEATURES • Wide 4.5V to 21V Operating Input .

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The Future of Analog IC Technology
MP28254
High Efficiency 4A, 21V, 500kHz
Synchronous Step down Converter
DESCRIPTION
The MP28254 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
MP28254 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 MP28254 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
TYPICAL APPLICATION
VIN
1 IN
BST 6
C1
22uF
C4
0.1uF
C3
0.1uF
10
R3
100K
VCC
MP28254
SW
2, 3
4, 5
PG
9 PG
FB 8
Rt
25K
EN 7 EN/SYNC
GND
11, 12, 13, 14
FEATURES
Wide 4.5V to 21V Operating Input Range
4A Output Current
Low Rds(on) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
High Efficiency Synchronous Mode Operation
Fixed 500kHz Switching Frequency
Sync from 300kHz to 2MHz External Clock
Internal Compensation
Integrated Bootstrap Diode
OCP Protection and Thermal Shutdown
Output Adjustable from 0.805V
Available in a 3mm x 4mm 14-Pin QFN
Package
APPLICATIONS
Notebook Systems and I/O Power
Networking Systems
Digital Set Top Boxes
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance
page.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
VOUT
1.2V@4A
R1
5K
C2
47uF
R2
10K
Efficiency
VOUT=1.2V
100
90
VIN=5V
80
70 VIN=21V
60
50
40
30
20
10
0
012
VIN=12V
3
OUTPUT CURRENT (A)
4
MP28254 Rev. 1.01
www.MonolithicPower.com
5/15/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1

                    
                    






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