EV2105DJ-00A
800mA Synchronous Buck
Step-Down Converter
Monolithic Power Systems
INITIAL RELEASE
GENERAL DESCRIPTION
The EV2105 evaluation board is designed for
low dropout step down converter applications. It
implements the MP2105 1MHz Fixed
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 equipments that runs from a
single cell Lithium-Ion (Li+) Battery. It 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. In 100% Duty Cycle
Dropout operation, it works with minimum input
voltage as low as output voltage.
FEATURES
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High Efficiency: Up to 95%
800mA Available Load Current
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Short Circuit Protection
Thermal Fault Protection
<0.1碌A Shutdown Current
Programmable Enable Control
Cellular and Smart Phones
Microprocessors/DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
APPLICATIONS
ELECTRICAL SPECIFICATION
Parameter
Input Voltage Range
Output Voltage
Load Max
Symbol
V
IN
V
OUT
I
OUT
Value
2.5 to 6.0
1.8
800
Units
V
V
mA
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, 鈥淢PS鈥? 鈥淢onolithic Power Systems鈥? and 鈥淭he Future of Analog IC
Technology鈥?are Registered Trademarks of Monolithic Power Systems, Inc.
EV2105DJ-00A EVALUATION BOARD
Efficiency vs
Load Current
100
90
80
V
IN
= 3.3V
V
IN
= 4.2V
EFFICIENCY (%)
70
60
50
40
30
20
10
Dimensions (2.0鈥漍 x 2.0鈥漎 x 0.5鈥漐)
Board Number
EV2105DJ-00A
MPS IC Number
MP2105DJ
0
10
100
LOAD CURRENT (mA)
1000
MP2105-EC01
12/04, Rev. 1.0
www.MonolithicPower.com
1
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