MP28253 Datasheet, PDF (1/15 Pages) Monolithic Power Systems – 21V, 3A, 500kHz Synchronous Step-down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28253 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 3A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP28253 operates at high efficiency over a
wide 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 MP28253 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
MP28253
21V, 3A, 500kHz
Synchronous Step-down Converter
FEATURES
• Wide 4.5V to 21V Operating Input Range
• 3A Output Current
• Low R_DS(ON) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• Fixed 500kHz Switching Frequency
• External Soft-Start
• Sync from 300kHz to 2MHz External Clock
• Internal Compensation
• Integrated Bootstrap Diode
• Over-Current Protection and Hiccup
• Thermal Shutdown
• Output Adjustable from 0.8V
• Available in 14-pin QFN3x4 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
TYPICAL APPLICATION （FOR NOTEBOOK）
VIN
4.5V-21V
1 _IN
BST ⁶
C1
MP28253
PG
R3
100k
ON/OFF
9 _PG
SW ^2,3,4,5
11 _VCC
7 _EN/SYNC
Rt
FB ⁸
24k
C5
47nF
SS ¹⁰
GND AGND
12,13 14
R1
4.99k
VOUT 1.2V/3A
R2
10k
MP28253 Rev. 1.02
www.MonolithicPower.com
1
12/25/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.