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MP8801 – LOW DROPOUT, 150mA LINEAR REGULATOR
MP8801 Rev. 1.7
10/3/2006
www.MonolithicPower.com
4
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin #
Name
Description
Power Source Input. IN supplies the internal power to the MP8801 and is the source of the
pass transistor. Bypass IN to GND with a 1μF or greater capacitor.
Ground.
Enable Input. Drive EN high to turn on the MP8801; low to turn it off. For automatic startup,
connect EN to IN.
Feedback Input. Connect a resistive voltage divider from OUT to FB to set the output
voltage. The OUT feedback threshold is 1.222V.
Regulator Output. OUT is the output of the linear regulator. Bypass OUT to GND with a
1μF or greater capacitor.
1
IN
2
GND
3
EN
4
FB
5
OUT
OPERATION
The MP8801 is a low-current, low-noise,
high-PSRR, low-dropout linear regulator. It is
intended for use in devices that require very low
noise power supplies and high-PSRR such as
PLL VCO supplies for mobile handsets and
802.11 PC Cards, as well as audio codecs and
microphones. The MP8801 uses a PMOS pass
element and features internal thermal shutdown.
The normally fixed output MP8801 may be
converted to an adjustable output device by
applying a resistor divider network as shown in
Figure 2. An optional feed-forward capacitor,
C
BYP
, may be added for an improved transient
response.
V
IN
V
EN
C3
GND
FB
OUT
IN
1
EN
V
OUT
--
+
BANDGAP
REFERENCE
INTERNAL
RESISTOR
DIVIDER
C
BYP
2
3
4
5
Figure 1—Ultra-Low-Noise Fixed Output Regulator
V
IN
V
EN
C
OUT
C
BYP
R1
R2
V
OUT
--
+
BANDGAP
REFERENCE
GND
FB
OUT
EXTERNAL
RESISTOR
DIVIDER
1
2
3
4
5
Figure 2—Ultra-Low-Noise Adjustable Regulator: V
OUT
= V
FB
(1+(R1/R2))
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