TM
MP2105
1MHz, 800mA Synchronous
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP2105 is a 1MHz constant frequency,
current mode, PWM step-down converter. The
device integrates a main switch and a
synchronous rectifier for high efficiency without
an external Schottky diode. It is ideal for
powering portable equipment that runs from a
single cell Lithium-Ion (Li+) battery. The
MP2105 can supply 800mA of load current from
a 2.5V to 6V input voltage. The output voltage
can be regulated as low as 0.6V. The MP2105
can also run at 100% duty cycle for low dropout
applications.
The MP2105 is available in a low profile (1mm)
5-pin, TSOT package.
FEATURES
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High Efficiency: Up to 95%
1MHz Constant Switching Frequency
800mA Available Load Current
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Current Mode Control
Short Circuit Protection
Thermal Fault Protection
<0.1µA Shutdown Current
Space Saving 5-Pin TSOT23 Package
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV2105DJ-00A
Dimensions
2.0”X x 2.0”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs
Load Current
100
INPUT
2.5V to 6V
4
IN
SW
3
MP2105
OFF ON
1
EN
GND
2
FB
5
EFFICIENCY (%)
OUTPUT
1.8V
800mA
90
80
70
60
50
40
30
20
10
0
V
IN
= 3.3V
V
IN
= 4.2V
MP2105_TAC_S01
10
100
LOAD CURRENT (mA)
1000
MP2105-EC01
MP2105 Rev. 1.2
8/19/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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