MP28127 Datasheet, PDF (1/9 Pages) Monolithic Power Systems – 1.25A, 5.5V Synchronous Step-Down Switching Regulator

The Future of Analog IC Technology
DESCRIPTION
The MP28127 is an internally compensated
1.5MHz fixed frequency PWM synchronous
step-down regulator. MP28127 operates from a
2.7V to 5.5V input and generates an output
voltage as low as 0.8V.
The MP28127 integrates a high-side switch and
a synchronous rectifier for high efficiency
without an external Schottky diode. With peak
current mode control and internal
compensation, the MP28127 based solution
delivers a very compact footprint with a
minimum component count.
The MP28127 is available in a small 3mm x
3mm 10-lead QFN package.
MP28127
1.25A, 5.5V Synchronous
Step-Down Switching Regulator
FEATURES
• 1.25A Output Current
• Input Operation Range: 2.7V to 5.5V
• All Ceramic Capacitor Design
• 1.5MHz Fixed Switching Frequency
• Adjustable Output from 0.8V to 0.9xV_IN
• Internal Soft-Start
• Frequency Synchronization Input
• Power Good Output
• Thermal Shutdown
• Cycle-by-Cycle Current Limiting
• Hiccup Short Circuit Protection
• 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
2.7V to 5.5V
47
POK
OFF ON
IN
POK
BS
SW
MP28127
EN/SYNC
FB
GND
C3
100nF
1.2
400
310
V_OUT
1.8V / 1.25A
47
MP28127 Rev. 0.9
www.MonolithicPower.com
1
6/7/2010
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