EV0060 Datasheet, PDF (5/5 Pages) Monolithic Power Systems – 1.2A, 6V, 800KHz Synchronous Rectified Step-Down Converter

EV0060 – 1.2A, 6V, 800KHz SYNCHRONOUS RECTIFIED STEP-DOWN 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 OUT and GND pins respectively.
2. Attach an input voltage 2.6V ≤ V_IN ≤ 6V and the input ground to the IN and GND pins,
respectively.
3. To enable the MP1567 apply a voltage, 2V ≤ V_EN ≤ 6V, to the EN pin. To disable the MP1567
connect the EN pin to ground.
4. The output voltage V_OUT can be changed by varying R3. Calculate the new value using the
formula:
R3
=
R4
×
⎜⎜⎝⎛
V_OUT
V_FB
− 1_{⎟⎟⎠⎞}
Where V_FB = 0.9V and R4 = 10kΩ.
For example, for V_OUT = 2.5V:
R3
=
R4
×
⎜⎜⎝⎛
V_OUT
V_FB
−
1_{⎟⎟⎠⎞}
=
10kΩ
×
⎜⎛
⎝
2.5V
0.9V
− 1⎟⎞ = 17.78kΩ
⎠
Therefore use a standard 1% value 17.8kΩ resistor.
Note: See Maximum Duty Cycle limits to determine allowable output voltages.
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.
EV0060 Rev. 1.2
www.MonolithicPower.com
5
4/22/2005
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