MP28266 Datasheet, PDF (1/14 Pages) Monolithic Power Systems – 21V, 3A, 500kHz, Synchronous Step-Down Converter

The Future of Analog IC Technology
MP28266
21V, 3A, 500kHz, Synchronous
Step-Down Converter
DESCRIPTION
The MP28266 is a synchronous, rectified, step-
down, switch-mode converter with built in
internal power MOSFETs. It offers a very
compact solution to achieve a 3A continuous
output current over a wide input supply range,
with excellent load and line regulation. The
MP28266 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 MP28266 requires a minimal number of
readily-available standard external components,
and is available in a space-saving 3mm×4mm
14-pin QFN package.
FEATURES
 Wide 6V-to-21V Operating Input Range
 0.6V Internal Reference with 2% Accuracy
 3A Output Current
 Low-R_ds(ON) Internal Power MOSFETs
 Fixed 500kHz Switching Frequency
 Frequency SYNC from a 300kHz-to-2MHz
External Clock
 External Soft-Start
 AAM Power-Save Mode
 OCP and Thermal Shutdown
 Available in a 3mm×4mm QFN14 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 Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
6V-21V
C1A
22 F
1
C1B
0.1
11
R4
90.9k
C4
0.1 F
IN
BST
VCC
SW
MP28266
6
2,3,4,5
C3 _L1
0.1 F _{2.8 H}
AAM
R3
10k
SYNC
C5
1F
7 _AAM
9 _SYNC
FB ⁸
SS ¹⁰
R8
24k
C7
47nF
1.2V/3A
C2A
R1
22 F
10k
VOUT
R2
10k
MP28266 Rev. 1.0
www.MonolithicPower.com
1
3/16/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.