MP20045DN datasheet(4/5 Pages) MPS

4 / 5 page

EV20045DN-00A – LOW NOISE, 1A LINEAR REGULATOR

EV20045DN-00A Rev. 1.0

www.MonolithicPower.com

11/3/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

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 ≤ VIN ≤ 5.5V) and Input Ground to the VIN and GND pins,

respectively.

3. To enable the MP20045, apply a voltage, 1.5V ≤ VEN ≤ 5.5V, to the EN pin. To disable the MP20045,

apply a voltage, VEN < 0.4V, to the EN pin. The EN pin can be connected to VIN with a 100kΩ

resistor for automatic startup.

4. The Output Voltage VOUT can be changed by varying R2. Calculate the new value by formula:

OUT

() 1

−

Where VFB = 1.5V and R1 = 10kΩ.

Example:

For VOUT = 3.0V:

10kΩ

)

1.5

3.0

(

10kΩ

−

Therefore, use a 10kΩ standard 1% value.

MP20045

COUT

2.2

C3(optioanl)

0.1

VOUT

VIN

100k

OUT

(1+

)Volts

1.5

Figure 4—Adjustable Version

MP20045

COUT

2.2

VOUT

VIN

100k

CIN

Figure 5—Fixed Version

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