MP2040 –FAST TRANSIENT RESPONSE, 3A VERY LOW DROPOUT LINEAR REGULATOR

MP2040 Rev.1.0

www.MonolithicPower.com

4

9/21/2010

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PIN FUNCTIONS

QFN3X3 10pins

Pin #

Name

Description

9, 10

VOUT

Regulator Output. OUT is the output of the linear regulator, By pass OUT to GND with a

4.7µF or greater capacitor.

3

BIAS

Bias Voltage. Bypass to ground with a 1µF or greater capacitor, VB>=VIN.

8

FB

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

voltage. OUT feedback threshold is 0.51V.

7

EN

Enable Input. Drive EN high to turn on the MP2040, drive EN low to turn it off. For

automatic startup, connect EN to IN.

5

GND

Ground, exposed pad.

1, 2

VIN

Power Source Input. IN supplies power to the load at the output (through the power

transistor). Bypass IN to GND with a 1µF or greater capacitor.

4

6

BYPASS Connect a 1nF to this pin. Do not load this pin resistively.

QFN5x5 32pins

Pin #

Name

Description

20, 21,22,

23

VOUT

Regulator Output. OUT is the output of the linear regulator, By pass OUT to GND with a

4.7µF or greater capacitor.

6

BIAS

Bias Voltage. Bypass to ground with a 1µF or greater capacitor, VB>=VIN.

19

FB

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

voltage. OUT feedback threshold is 0.51V.

18

EN

Enable Input. Drive EN high to turn on the MP2040, drive EN low to turn it off. For

automatic startup, connect EN to IN.

8

GND

Ground, exposed pad.

2, 3, 4, 5

VIN

Power Source Input. IN supplies power to the load at the output (through the power

transistor). Bypass IN to GND with a 1µF or greater capacitor.

7

17

BYPASS Connect a 1nF to this pin. Do not load this pin resistively.

1, 9, 10,

11, 12,

13, 14,

15, 16,

24, 25,

26, 27,

28, 29,

30, 31, 32

NC

These are no connection pins.