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MP8802 – LOW DROPOUT, 250mA LINEAR REGULATOR
MP8802 Rev. 1.3
3/6/2006
www.MonolithicPower.com
5
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
APPLICATION INFORMATION
SETTING THE OUTPUT VOLTAGE
The fixed output voltage of the MP8802DJ is set
to 2.5V, 2.85V 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 100k
to minimize the impact of the
internal resistor divider. For accurate output-
voltage setting, it is suggested to use 10k
(
±
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
Where V
FB
is the OUT feedback threshold
voltage equal to 1.222V.
Example: For 2.5V Output
=
222
=
k
41
.
10
k
10
V
.
V
222
.
V
5
1
R
You can select a standard 10.5k
(
±
1%)
resistor for R1.
The following table lists the selected R1 values
for some typical output voltages:
Table 1—Adjustable Output Voltage R1 Values
V
OUT
(V)
R1 (
)
1.25
1.5
1.8
2
2.5
2.8
3
3.3
4
5
232
2.26k
4.75k
6.34k
10.5k
13k
14.7k
16.9k
22.6k
30.9k
In Figures 3 and 4, C2 is added for an improved
transient response.
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