EVQ28261-L-00A
21V, 3A 500kHz Synchronous
Step-down Converter EV Board
EVQ28261-L-00A Rev.1.0 www.MonolithicPower.com 1
11/15/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EVQ28261-L-00A is for demonstrating
MPS’s MPQ28261, a high frequency
synchronous rectified step-down switch mode
converter with built in internal power MOSFETs.
MPQ28261 offers a very compact solution to
achieve 3A continuous output current over a
wide input supply range with excellent load and
line regulation. The MPQ28261 operates at
high efficiency over a wide output current load
range.
Current mode operation provides fast transient
response and eases loop stabilization. The full
protection features include OCP and thermal
shutdown.
The MPQ28261 requires a minimum number of
readily available standard external components
and comes in a space saving 3x4mm 14-pin
QFN package.
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Input Voltage V
IN
7 – 21 V
Output Voltage V
OUT
1.2 V
Output Current I
OUT
3 A
FEATURES
Wide 7V 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
External Soft Start
OCP and Thermal Shutdown
Available in 14-pin QFN3x4 Package
APPLICATIONS
DSL Modems
Cable Modems
Set Top Boxes
“For MPS green status, please visit MPS website under Quality Assurance
MPS” and “The Future of Analog IC Technology”, are Registered Trademarks o
Monolithic Power Systems, Inc.
DAM (Analog Digital Adaptive Modulation), AAM (….) areTrademarks o
Monolithic Power Systems, Inc.
The EVQ28261-L-00A is covered by US Patents,
EVQ28261-L-00A EVALUATION BOARD
Board Number MPS IC Number
EVQ28261-L-00A MPQ28261DL
Efficiency vs. Load Current
V
OUT
=1.2V
EFFICIENCY (%)
LOAD CURRENT (A)
0
10
20
30
40
50
60
70
80
90
100
00.5 11.5 22.5 33.5
V
IN
=21V
V
IN
=12V
V
IN
=4.5V
