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MP8802 – LOW DROPOUT, 250mA LINEAR REGULATOR
MP8802 Rev. 1.3
3/6/2006
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 MP8802 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 MP8802, drive EN 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. 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 MP8802 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 MP8802 uses a PMOS pass
element and features internal thermal shutdown.
As shown in Figures 1 and 2, optional feed-
forward capacitor C
BYP
may be added between
FB and OUT pins for an improved transient
response.
MP8802_F01_BD01
V
IN
V
EN
C
OUT
GND
FB
OUT
V
OUT
--
+
BANDGAP
REFERENCE
INTERNAL
RESISTOR
DIVIDER
C
BYP
Figure 1—Ultra-Low-Noise Fixed Output Regulator
MP8802_F02_BD02
V
IN
V
EN
C
OUT
C
BYP
R1
R2
V
OUT
--
+
BANDGAP
REFERENCE
GND
FB
OUT
EXTERNAL
RESISTOR
DIVIDER
Figure 2—Ultra-Low-Noise Adjustable Regulator: V
OUT
= V
FB
(1+(R1/R2))
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