MP8902

– LOW DROPOUT, 250mA LINEAR REGULATOR

MP8902 Rev. 1.0

www.MonolithicPower.com

6

9/4/2017

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APPLICATION INFORMATION

SETTING THE OUTPUT VOLTAGE

The fixed output voltage of the MP8902DG is set

to 2.5V or 3.3V, depending on the internal

resistor divider (Figure 1). You can also adjust

the output voltage by using an external resistor

divider (R1 and R2 in Figure 2). However, the

sum of R1 and R2 should not exceed 100kΩ to

minimize the impact of the internal resistor

divider. For accurate output-voltage setting, it is

suggested to use 10kΩ (

1%) for the low-side

resistor R2 of the voltage divider, the high side

resistor R1 can be determined by the equation:



















FB

FB

OUT

V

V

V

2

R

1

R

voltage equal to 1.222V.

Example: For 2.5V Output























k

41

.

10

k

10

V

222

.

1

V

222

.

1

V

5

.

2

1

R

You can select a standard 10.5kΩ (

1%)

resistor for R1.

The following table lists the selected R1 values

for some typical output voltages:

Table 1

—Adjustable Output Voltage R1 Values

R1 (

Ω)

1.25

232

1.5

2.26k

1.8

4.75k

2

6.34k

2.5

10.5k

2.8

13k

3

14.7k

3.3

16.9k

4

22.6k

5

30.9k

In Figures 3 and 4, C2 is added for an improved

transient response.