MP2127 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 2.7-6V Input, 2A, 1.2MHz Synchronous Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP2127 is a fully integrated, internally
compensated 1.2MHz fixed frequency PWM
step-down converter. It is ideal for powering
portable equipment that runs from a single cell
Lithium-Ion (Li+) Battery, with an input range
from 2.7V to 6V. The MP2127 can provide up to
2A of load current with output voltage as low as
0.8V. It can also operate at 100% duty cycle for
low dropout applications. With peak current
mode control and internal compensation, the
MP2127 is stable with ceramic capacitors and
small inductors. Fault condition protection
includes cycle-by-cycle current limiting and
thermal shutdown.
MP2127 is available in the small 6-pin
3mmx3mm QFN package.
MP2127
2.7-6V Input, 2A, 1.2MHz
Synchronous Step-Down Converter
FEATURES
• Output Adjustable from 0.8V to VIN
• Up to 95% Efficiency
• 100% Duty Cycle for Low Dropout
Applications
• Power Good Indicator Output
• 1.2MHz Fixed Switching Frequency
• Stable with Low ESR Output Ceramic
Capacitors
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Short circuit protection
• 2.7V-6V Input Operation Range
• Available in 6-pin 3x3mm QFN
APPLICATIONS
• Smart Phones, PDA’s
• DVD+/-RW Drives
• Digital Cameras
• Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
2.7V 6V
4
PVIN
R3
100k
6
PGOOD
C1
10
5
3
L1
VIN MP2127 SW
3.3
2
GND
FB 1
PGOOD
R1
20k
R2
40k
VOUT
1.2V/2A
C1
33
Efficiency vs.
Load Current
100
90
VIN=3V
80
70 ^VIN=5V
60
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
LOAD CURRENT(A)
MP2127 Rev. 0.91
www.MonolithicPower.com
1
4/27/2010
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