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| 型號(hào)： | EV8801DJ-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | Low Dropout 150mA Linear Regulator |
| 中文描述： | 150mA的低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 299K |
| 代理商： | EV8801DJ-00A |
MP8801 – LOW DROPOUT, 150mA LINEAR REGULATOR
MP8801 Rev. 1.7
10/3/2006
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 MP8801DJ 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
in order to minimize the impact
of the internal resistor divider. For an accurate
output-voltage setting, use 10k
(
±
1%) for the
low-side resistor R2 of the voltage divider, while
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 (
)
R2 (
)
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
10k
In Figures 3 and 4, C2 is added for an improved
transient response.
INPUT CAPACITOR SELECTION
For proper operation, place a ceramic capacitor
(C1) between 1
μ
F and 10
μ
F of dielectric type
X5R or X7R between the input pin and ground.
Larger values in this range will help improve
line transient response at the drawback of
increased size.
OUTPUT CAPACITOR SELECTION
For stable operation, use a ceramic capacitor
(C3) of type X5R or X7R between 1
μ
F and
10
μ
F. Larger values in this range will help
improve load transient response and reduce
noise with the drawback of increased size.
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)
100nF feed forward capacitor in parallel with
R1. The feed forward capacitor is not required
for stable operation.
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