MP2128
2.5V-6V Input, 3MHz, 1A
Synchronous Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2128 is a 3MHz constant frequency,
current mode, PWM step-down converter with
integrated main switch and synchronous
rectifier that is ideal for powering portable
equipment that runs from a single Li-Ion or Li-
Polymer battery.
The MP2128 can supply up to 1A load current
from a 2.5V to 6V input voltage. The output
voltage can be as low as 0.6V.
Additional features include <1µA shutdown
current, internal soft-start, cycle-by-cycle over
current protection, short circuit protection, and
thermal shutdown.
The MP2128 is available in low profile (1.5mm)
5-pin SOT23 and 8-pin, QFN8 2mm×2mm
packages.
FEATURES
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High Efficiency: Up to 95%
3MHz Constant Switching Frequency
1A Available Load Current
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
Current Mode Control
Cycle-by-Cycle Over Current Protection
Short Circuit Protection
Thermal Shutdown
<1µA Shutdown Current
Internal Soft-Start
Space Saving 5-Pin SOT23 Package and
8-pin, QFN8 2mm×2mm package
Cellular Phones
Microprocessors and DSP Core Supplies
PDAs and Smart Phones
MP3 and Portable Media Players
Digital Still and Video Cameras
Portable Instruments
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
U1
2.5V--6V
VIN
3
IN
SW
SW
6
5
R1
200k
1%
1.8V 1A
VOUT
MP2128DG
OFF ON
8
EN
FB
1
R2
100k
1%
7
NC
AGND
2
PGND
4
MP2128 Rev. 0.9
7/20/2009
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
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