EV20045DQ-00A
– LOW NOISE, HIGH PSRR, 1A LINE REGULATOR
EV20045DQ-00A Rev. 1.0
www.MonolithicPower.com
4
5/2/2018
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QUICK START GUIDE (ADJUSTABLE OUTPUT)
The output voltage of this board is set externally which ranges from 1.5V to 5V by operating from +2.5V
to +5.5V input as the figure 4. The default output voltage of this board is set to 3.0V.
The board layout accommodates most commonly used resistors and capacitors.
1. Attach the positive and negative ends of the load to the VOUT and GND pins, respectively.
2. Attach the Input Voltage (3.5V
≤
V
IN
≤
5.5V) and Input Ground to the VIN and GND pins,
respectively.
3. To enable the MP20045 apply a voltage, 1.5V
≤
V
EN
≤
5.5V, to the EN pin. To disable the
MP20045 apply a voltage, V
EN
< 0.4V, to the EN pin. The EN pin can be connected to V
IN
with a
100k
Ω resistor for automatic startup.
4. The Output Voltage V
OUT
can be changed by varying R2. Calculate the new value by formula:
1
)
V
V
(
R1
R2
FB
OUT
Where VFB = 1.5V and R1 = 10
kΩ.
Example:
For V
OUT
= 3.0V:
10k
Ω
1
)
1.5
3.0
(
10k
Ω
R2
Therefore, use a 10k
Ω standard 1% value.
Figure 4
—Adjust Version
Figure 5
—Fixed Version