MP28115 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 4A, 1.5MHz Synchronous Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28115 is an internally compensated
1.5MHz fixed frequency PWM synchronous
step-down regulator. MP28115 operates from a
2.7V to 6V input and generates an adjustable
output voltage from 0.8V to 0.9xV_IN at up to 4A
load current.
The MP28115 integrates a 60mΩ 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 MP28115 based
solution achieves minimum footprint and
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 MP28115 is available in a small 3mm x
3mm 10-lead QFN package.
MP28115
4A, 1.5MHz Synchronous
Step-Down Converter
FEATURES
• 4A Output Current
• Input Operation Range: 2.7V to 6V
• 1.5% Output Accuracy
• 60mΩ Internal Power MOSFET Switches
• All Ceramic Capacitor Design
• Up to 95% Efficiency
• 1.5MHz Fixed Switching Frequency
• Internal Soft-Start
• Frequency Synchronization Input
• Power Good Output
• Cycle-by-Cycle Current Limiting
• Hiccup Short Circuit Protection
• 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
Vin
2.7V to 6V
C1
10uF
R4
100k
R3
100k
C2
10uF ^4,7
IN
6
POK
5
BS
SW ^3,8
MP28115
10 _EN/SYNC
FB ¹
GND
2,9
C4
100nF
L1
1uH
D1
B0530
R1
400k
R2
316k
Vout
1.8V/4A
C3
47uF
Efficiency vs
Output Current
95
90
5V to 1.8V
85
5V to 3.3V
5V to 2.5V
80
75
70
0
1
2
3
4
OUTPUT CURRENT (A)
MP28115 Rev. 0.92
www.MonolithicPower.com
1
8/23/2010
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