EV2105DJ-00A Datasheet, PDF (4/4 Pages) Monolithic Power Systems – 800mA Synchronous Buck Step-Down Converter

EV2105DJ-00A – 800mA SYNCHRONOUS BUCK STEP-DOWN CONVERTER
INITIAL RELEASE
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 Positive end and Negative end of Load to VOUT and GND pins respectively.
2. Attach Input Voltage 2.5V ≤ V_IN ≤ 6V and Input Ground to VIN and GND pins respectively.
3. To enable the MP2105 apply a voltage, 1.5V ≤ V_EN ≤ 6V, to the EN pin. To disable the MP2105
apply a voltage, V_EN < 0.3V, to the EN pin. The default setting for the jumper J1 on the board
connects V_IN to the EN pin. With this configuration, the part will operate without applying any
external voltage to the EN pin.
4. The Output Voltage V_OUT can be changed by varying R2. Calculate the new value by formula:
R2 = ^R1
⎜⎜⎝⎛
V_OUT
V_FB
⎟⎟⎠⎞
−
1
Where V_FB = 0.6V and R1 = 499kΩ.
Example:
For V_OUT = 2.5V:
R2 = ^499kΩ = 174kΩ
⎜⎛ ^2.5V ⎟⎞ − 1
⎝ ^0.6V ⎠
Therefore, use a 174kΩ standard 1% value.
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without
notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual
Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal
responsibility for any said applications.
EV2105DJ-00A Rev. 1.0
Monolithic Power Systems, Inc.
4
12/2/04
983 University Avenue, Building A, Los Gatos, CA 95032 USA
© 2004 MPS, Inc.
Tel: [phone] ♦ Fax: [phone] ♦ www.MonolithicPower.com