MP8904 –500mA LINEAR REGULATOR

MP8904 Rev. 1.02

www.MonolithicPower.com

7

6/6/2012

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© 2012 MPS. All Rights Reserved.

PIN FUNCTIONS

OPERATION

The MP8904 is a low-current, low-voltage, low-

dropout, linear regulator. It is intended for

devices that require very low voltage and low

quiescent current power, such as wireless

modems and cellular phones.

The MP8904 uses a PNP pass element and

features internal thermal shutdown and internal

current limit circuit.

PG

GND

FB

OUT

EN

5V

PG

8

--

+

--

+

C2

R2

0.5V

REF

R1

R3

THERMAL

PROTECT

C1

3

5

6

4

1

Figure 1: Functional Block Diagram

Pin #

Name

Description

1

OUT

Regulator Output. Bypass OUT to GND with a

2

NC

No connect.

3

PG

Power-Good Open Collector Output. Monitors the regulator output. If the regulator

output falls below 10% of its regulation point, the power-good pin goes low.

4

FB

Feedback. Connect a resistive voltage divider from OUT to FB to set the output

voltage. OUT feedback threshold is 0.5V.

5

EN

Enable Input. Drive EN above 1.2V to turn on the MP8904. Drive EN below 0.4V to

turn it off.

6

GND

Ground.

7

NC

No connect.

8

IN

Power Source Input. IN supplies the internal power to the MP8904 and is the source

for the pass transistor. Bypass IN to GND with a

Exposed

Pad

Connect to GND.