MP28275 Datasheet, PDF (1/14 Pages) Monolithic Power Systems – 7V, 5A, 1.1MHz Synchronous Step-down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28275 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 5A continuous
output current with excellent load and line
regulation. The MP28275 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 MP28275 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
MP28275
7V, 5A, 1.1MHz
Synchronous Step-down Converter
FEATURES
 4.5V to 7V Operating Input Range
 5A Output Current
 Low R_DS(ON) Internal Power MOSFETs
 Proprietary Switching Loss Reduction
Technique
 Fixed 1.1MHz Switching Frequency
 Sync from 300kHz to 2MHz External Clock
 Internal Compensation
 Thermal Shutdown
 Over-Current-Protection and Hiccup
 Output Adjustable from 0.8V
 Available in 3x4mm QFN14 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
“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）
1 _IN
BST ⁶
C3
0.1uF
C1
22uF
11
R3
100K
VCC
MP28275
C4
0.1uF
SW
2, 3
4, 5
L1
1.2uH
PG
9 _PG
FB ⁸
Rt
25K
EN
7 _EN/SYNC
GND
12, 13, 14
VOUT
1.2V@5A
R1
5K
C2
47uF
R2
10K
Efficiency
V_OUT=1.2V
100
90
V_IN=5V
80
70
V_IN=7V
60
50
40
30
20
10
0
0
1
2
3
4
5
OUTPUT CURRENT (A)
MP28275 Rev. 1.0
www.MonolithicPower.com
1
5/29/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.