MP2128 Datasheet, PDF (1/8 Pages) Monolithic Power Systems – 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.
MP2128
2.5V-6V Input, 3MHz, 1A
Synchronous Step-Down Converter
FEATURES
• 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
APPLICATIONS
• Cellular Phones
• Microprocessors and DSP Core Supplies
• PDAs and Smart Phones
• MP3 and Portable Media Players
• Digital Still and Video Cameras
• Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
2.5V--6V
VIN
3 _IN
U1
SW ⁶
SW ⁵
OFF ON
MP2128DG
8 _EN
FB ¹
7 _NC
PGND ⁴
AGND
2
R1
200k
1%
R2
100k
1%
1.8V 1A
VOUT
MP2128 Rev. 0.9
www.MonolithicPower.com
1
7/20/2009
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