MP2249 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – 1MHz, 6V, 3A, Low-Voltage Synchronous Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP2249 is a 1MHz constant frequency,
current mode, PWM step-down converter. The
device integrates a main switch and a
synchronous rectifier for high efficiency and
eliminates the need for an external Schottky
diode. It is ideal for powering portable
equipment that runs from a single cell Lithium-
Ion (Li+) battery.
The MP2249 can supply 3A of load current from
a 2.5V to 6V input voltage. It can run at 100%
duty cycle for low dropout applications. The
MP2249 provides internal soft-start control to
reduce rush current and output discharge
function to control discharging of the output
capacitor.
The MP2249 is available in small 3mmx3mm
TQFN10 or SOIC8E package.
TYPICAL APPLICATION
MP2249
1MHz, 6V, 3A, Low-Voltage
Synchronous Step-Down Converter
FEATURES
• High Efficiency: Up to 90%
• Power Save Mode at Light Load
• 1MHz Constant Switching Frequency
• Up to 4.5A Peak Current
• 2.5V to 6V Input Voltage Range
• Output Adjustable from 0.6V to VIN
• 100% Duty Cycle in Dropout
• Output Discharge Function
• Internal Soft-Start Control
• Power Good Indicator
• Short Circuit Protection
• Thermal Fault Protection
• Available in 3mmx3mm TQFN10 or SOIC8E
Package
APPLICATIONS
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies
• PDAs
• MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
R3
VIN / 5V
C1
10
PVIN
PG
MP2249
PVIN
SW
C2
10
EN
FB
ON OFF
GND
PG
L1
2.2 H
R1
R2
VOUT /1.8V
C3
C4
22
MP2249 Rev.1.0
www.MonolithicPower.com
1
11/2/2010
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