MP28254 Datasheet, PDF (1/14 Pages) Monolithic Power Systems – High Efficiency 4A, 21V, 500kHz Synchronous Step down Converter

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
6
BST
C1
22uF
C4
0.1uF
C3
0.1uF
10
R3
100K
VCC
MP28254
2, 3
SW _{4, 5}
8
PG
9
PG
FB
Rt
25K
7
EN
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
V_OUT=1.2V
100
90
V_IN=5V
V_IN=12V
80
70
V_IN=21V
60
50
40
30
20
10
0
0
1
2
3
4
OUTPUT CURRENT (A)
MP28254 Rev. 1.01
www.MonolithicPower.com
1
5/15/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.