MP28128 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 2.5A, 1.5MHz Synchronous Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28128 is a 1.5MHz fixed frequency
PWM synchronous step-down regulator with
internal compensation. MP28128 operates from
a 2.7V to 6V input and generates an adjustable
output voltage from 0.8V to 0.9xV_IN at up to
2.5A load current.
The MP28128 integrates an 80mΩ high-side
switch and a 60mΩ synchronous rectifier for
high efficiency without an external Schottky
diode. With peak current mode control and
internal compensation, the MP28128 based
solution delivers a very compact footprint with a
minimum component count. Fault condition
protection includes hiccup short-circuit
protection, cycle-by-cycle current limiting and
thermal shutdown. Other features include
frequency synchronization input, internal soft-
start and power good output.
The MP28128 is available in a small 3mm x
3mm 10-lead QFN package.
MP28128
2.5A, 1.5MHz Synchronous
Step-Down Converter
FEATURES
• 2.5A Output Current
• Input Operation Range: 2.7V to 6V
• 1.5% Output Accuracy
• Internal Power MOSFET Switches
• All Ceramic Capacitor Design
• 1.5MHz Fixed Switching Frequency
• Internal Soft-Start
• Frequency Synchronization Input
• Power Good Output
• Cycle-by-Cycle Current Limiting
• Thermal Shutdown
• 3mm x 3mm 10-lead QFN Package
APPLICATIONS
• µP/ASIC/DSP/FPGA Core and I/O Supplies
• Printers and LCD TVs
• Network and Telecom Equipment
• Point of Load Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V_IN
POK
OFF ON
IN
POK
BS
SW
EN/SYNC
FB
GND
Efficiency vs.
Output Current
95
90
85
5V to 1.8V 5V to 3.3V
5V to 2.5V
80
75
70
0 0.5 1 1.5 2 2.5
OUTPUT CURRENT (A)
MP28128 Rev. 0.92
www.MonolithicPower.com
1
2/13/2009
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.