MP28251GD-Z Datasheet, PDF (1/15 Pages) MPS Industries, Inc. – 20V, 4A Synchronous Step-Down Converter

The Future of Analog IC Technology
MP28251
20V, 4A Synchronous
Step-Down Converter
DESCRIPTION
The MP28251 is a synchronous, rectified, step-
down, switch-mode converter with internal
power MOSFETs. It offers a very compact
solution to achieve a 4A continuous output
current over a wide input supply range with
excellent load and line regulation. The
MP28251 has synchronous mode operation for
higher efficiency over the output current load
range.
Current-mode operation provides a fast
transient response and eases loop stabilization.
Full protection features include over-current
protection and thermal shutdown.
The MP28251 requires a minimal number of
readily-available standard external components
and is available in a space saving 2mm×3mm
14-pin QFN package.
TYPICAL APPLICATION
FEATURES
 Wide 4.75V-to-20V Operating Input Range
 4A Output Current
 Low R_DS(ON) Internal Power MOSFETs
 Programmable Switching Frequency
 Programmable EN Delay
 Frequency SYNC from 300kHz to 2MHz
External Clock
 Low Power Mode Selectable by an External
Signal
 External Soft Start
 OCP and Thermal Shutdown
 Available in a 14-pin QFN2×3 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 Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
VIN
VCC
ON
OFF EN
LPM
CDELAY
47nF
FREQ/SYNC
RFREQ
30.1k
U1
IN
VCC
R5
10
BS
SW
EN ^MP28251
LPM
FB
FREQ/SYNC
SS
GND
RT
0
CSS
22nF
3.3V VOUT
R1
30.1k
R2
10k
MP28251 Rev. 1.16
www.MonolithicPower.com
1
4/17/2013
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