MP2016 – 42V, 30mA, LOW POWER, LINEAR REGULATOR

MP2016 Rev.1.0

www.MonolithicPower.com

8

10/10/2011

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© 2011 MPS. All Rights Reserved.

APPLICATION INFORMATION

COMPONENT SELECTION

Setting the Output Voltage

Set the output voltage of the MP2016 by using a

resistor divider as shown:

MP2016

3

4

2

OUT

VOUT

FB

Figure 2—MP2016 with External Resistor

Divider

Choose R2=250kΩ to maintain a 5µA minimum

load. Calculate the value for R1 using the

following equation:

OUT

V

R1 R2

1

1.23V

⎛⎞

=×

−

⎜⎟

⎝⎠

Input Capacitor

For proper operation, place a ceramic capacitor

(C1) between 1µF and 10µF of dielectric type

X5R or X7R between the input pin and ground.

Larger values in this range will help improve line

transient response.

Output Capacitor

For stable operation, use a ceramic capacitor (C2)

of type X5R or X7R between 1µF and 10µF.

Larger values in this range will help improve load

transient response and reduce noise. Output

capacitors of other dielectric types may be used,

but are not recommended as their capacitance

can deviate greatly from their rated value over

temperature.

To improve load transient response, add a small

ceramic (X5R, X7R or Y5V dielectric) 22nF feed

forward capacitor in parallel with R1. The feed

forward capacitor is not required for stable

operation.

Output Noise

The MP2016 will exhibit noise on the output

during normal operation. This noise is negligible

for most applications. However, in applications

that include analog-to-digital converters (ADCs)

of more than 12 bits, one needs to consider the

ADC’s power supply rejection specifications.

The feed forward capacitor C3 across R1 will

significantly

reduce

the

output

noise.