EV2108DQ-00A Datasheet, PDF (4/4 Pages) Monolithic Power Systems – 2A, 6V, 720KHz Synchronous Buck Converter

TM
EV2108DQ/DK-00A – 2A, 6V, 720KHz SYNCHRONOUS BUCK CONVERTER
EVALUATION BOARD
QUICK START GUIDE
The output voltage of this board is set to 1.8V. The board layout accommodates most commonly used
inductors and output capacitors.
1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively.
2. Attach the input voltage (2.6V ≤ V_IN ≤ 6V) and input ground to the IN and GND pins,
respectively.
3. A pull-up resistor has connected the RUN pin to the VIN pin, so the MP2108 will startup
automatically without applying an external voltage to the RUN pin.
4. The output voltage V_OUT can be changed by varying R3. Calculate the new value using the
formula:
R3 = R4 × ( ^VOUT − 1)
V_FB
where V_FB = 0.9V and R4 = 10kΩ.
For example, for V_OUT = 2.5V:
R3 = R4 × ( ^VOUT − 1) = 10kΩ × ( ^2.5V − 1) = 17.78kΩ ~ 17.8kΩ
V_FB
0.9V
for the closest standard 1% value.
See Maximum Duty Cycle limits to determine allowable output voltages.
The optional bootstrap diode (D3) may be added for improved efficiency.
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV2108DQ/DK-00A Rev. 1.0
www.MonolithicPower.com
4
3/2/2006
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© 2006 MPS. All Rights Reserved.