EV2101DQ-00A Datasheet, PDF (5/5 Pages) Monolithic Power Systems – 1.6MHz, 800mA Synchronous Step-Down Converter plus 200mA LDO

EV2101DQ-00A – 1.6MHz, 800mA SYNCHRONOUS STEP-DOWN PLUS 200mA LDO
EVALUATION BOARD
QUICK START GUIDE
The output voltages on this board are set to 1.8V and 1.2V. The board layout accommodates most
commonly used inductors and output capacitors.
1. Attach the positive and negative ends of the load to the VOUT1/VOUT2 and GND pins,
respectively.
2. With the input supply off, attach the input voltage, 2.5V ≤ V_IN ≤ 6V, and the input ground to the
VIN and GND pins, respectively. Then turn on the power supply.
3. To enable the MP2101, apply a voltage, 1.5V ≤ V_EN ≤ 6V, to the EN1/EN2 pin. To disable the
MP2101, apply a voltage, V_EN < 0.3V, to the EN1/EN2 pin. The default setting for the jumper on
the board connects V_IN to the EN1/EN2 pin. In this configuration, the part will operate without
applying any external voltage to the EN1/EN2 pin.
4. The output voltages V_OUT1 and V_OUT2 can be changed by varying R2 and R4, respectively.
Calculate the new value by the formula:
R2 =
R1
⎜⎜⎝⎛
V_OUT1
V_FB1
⎟⎟⎠⎞
−
1
R4 =
R3
⎜⎜⎝⎛
V_OUT2
V_FB2
⎟⎟⎠⎞
−
1
Where V_FB1 = V_FB2 = 0.6V, R1 = 300kΩ, and R4 = 60.4kΩ
Example:
For V_OUT1 = 2.5V:
R2 = ^300kΩ = 94.7kΩ
⎜⎛ ^2.5V ⎟⎞ − 1
⎝ ^0.6V ⎠
Therefore, use a 95.3kΩ standard 1% value.
5. The JP1 Setting:
The JP1 can set the LDO input voltage from V_IN1 or V_OUT1.
6. EN1/EN2 Setting: JP2 and JP3
The EN1/EN2 signals can be turned on by connecting to the input voltage V_IN1 or an external
signal.
NOTICE: The information in this document is subject to change without notice. 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.
EV2101DQ-00A Rev. 1.1
www.MonolithicPower.com
5
8/18/2006
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