MP20045 – LOWER NOISE, 1A LINEAR REGULATOR

MP20045 Rev. 1.0

www.MonolithicPower.com

5

10/13/2010

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PIN DESCRIPTION

QFN8 (3X3)

Pin #

SOIC8E

Pin #

Name

Description

1, 2

7, 8

VIN

Regulator Input. Supply voltage ranges from +2.5V to 5.5V. Bypass with

2.2µF capacitor. These pins must be externally connected for proper

operation even if they are internally connected.

3, 4

1, 2

VOUT

Regulator output. Bypass with a 2.2µF low-ESR capacitor to GND.

Connect all the pin together externally.

5

3

FB

Feedback Input.

For the adjustable output version, connect FB to the center point of the

external resistor divider. The feedback threshold voltage is 1.5V.

For the fixed output version, connect FB to the output directly.

6

4

GND

Expose

d pad

Ground. Connect exposed pad to GND plane for optimal thermal

performance.

7

5

PG

Open-drain power-good (PG) output.

8

6

EN

Positive polarity enable (EN) input. Regulator Enable Control Input. Drive

EN above 1.5V to turn on the MP20045. Drive EN below 0.4V to turn it off.

Do not float the EN pin.