EV8802DJ-00A 查看數據表（PDF） - Monolithic Power Systems
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EV8802DJ-00A Datasheet PDF : 7 Pages
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MP8802 – LOW DROPOUT, 250mA LINEAR REGULATOR
PIN FUNCTIONS
Pin # Name Description
1
IN
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.
2
GND Ground.
3
EN
Enable Input. Drive EN high to turn on the MP8802, drive EN low to turn it off. For
automatic startup, connect EN to IN.
4
FB
Feedback Input. Connect a resistive voltage divider from OUT to FB to set the output
voltage. OUT feedback threshold is 1.222V.
5
OUT
Regulator Output. OUT is the output of the linear regulator. Bypass OUT to GND with a
1µF or greater capacitor.
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 CBYP may be added between
FB and OUT pins for an improved transient
response.
VIN
VEN
INTERNAL
RESISTOR
DIVIDER
+
--
BANDGAP
REFERENCE
GND
OUT
CBYP
VOUT
FB
COUT
MP8802_F01_BD01
Figure 1—Ultra-Low-Noise Fixed Output Regulator
VIN
VEN
EXTERNAL
RESISTOR
OUT DIVIDER
VOUT
R1
CBYP
+
--
BANDGAP
FB
REFERENCE
R2
COUT
GND
MP8802_F02_BD02
Figure 2—Ultra-Low-Noise Adjustable Regulator: VOUT = VFB(1+(R1/R2))
MP8802 Rev. 1.3
www.MonolithicPower.com
4
3/6/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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