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EV8801DJ-00A

Low Dropout 150mA Linear Regulator

Monolithic Power Systems 

MP8801 – LOW DROPOUT, 150mA LINEAR REGULATOR

PIN FUNCTIONS

Pin # Name Description

1

IN

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.

2

GND Ground.

3

EN

Enable Input. Drive EN high to turn on the MP8801; 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. The 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 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,

CBYP, may be added for an improved transient

response.

IN

VIN

1

EN

VEN

3

INTERNAL

RESISTOR

DIVIDER

+

--

BANDGAP

REFERENCE

2

GND

OUT

5

CBYP

4

FB

VOUT

C3

Figure 1—Ultra-Low-Noise Fixed Output Regulator

VIN

1

VEN

3

EXTERNAL

RESISTOR

OUT DIVIDER

5

VOUT

FB

+

4

--

BANDGAP

REFERENCE

R1

CBYP

R2

COUT

2

GND

Figure 2—Ultra-Low-Noise Adjustable Regulator: VOUT = VFB(1+(R1/R2))

MP8801 Rev. 1.7

www.MonolithicPower.com

4

10/3/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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