MP2013 - 40V, 150mA, LOW QUIESCENT CURRENT LINEAR REGULATOR

APPLICATION INFORMATION

COMPONENT SELECTION

Setting the Output Voltage

Set the output voltage of the MP2013 by using a

resistor divider as shown:

MP2013

OUT

FB

R1

R2

GND

Choose

R2=1M

Ω to maintain a 1.215µA

minimum load. Calculate the value for R1 using

the following equation:













−

×

=

1

1.215V

V

R2

R1

OUT

adjusted by adding external resistor divider. Just

note to take internal FB resistor divider into

consideration when choose external divider.

MP2013

OUT

FB

R1

R2

GND

R1_IN

R2_IN

Figure 3: FB Divider of Fixed Output Version

The internal FB resistor dividers for different fixed

output versions please see below table.

Table 1: Internal FB Resistor Divider

Fixed Output Voltage

R1_IN

R2_IN

3.3V

1.72M

Ω

1M

Ω

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 MP2013 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

C2

across

R1

will

significantly reduce the output noise.

PCB LAYOUT GUIDE

PCB layout is very important to achieve good

regulation, ripple rejection, transient response

and

thermal

performance.

It

is

highly

recommended

to

duplicate

EVB

layout

for

optimum performance.

If change is necessary, please follow these

guidelines and take figure 5 for reference.

1)

Input and output bypass ceramic capacitors

are suggested to be put close to the IN Pin

and OUT Pin respectively.

2)

Ensure all feedback connections are short

and direct. Place the feedback resistors and

compensation components as close to the

chip as possible.

MP2013 Rev. 1.0

www.MonolithicPower.com

10

4/23/2014

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