AP7331

300mA, LOW QUIESCENT CURRENT, FAST TRANSIENT

LOW DROPOUT LINEAR REGULATOR

AP7331

Document number: DS31914 Rev. 3 - 2

2 of 13

www.diodes.com

January 2011

© Diodes Incorporated

Typical Application Circuit

1uF

IN

GND

EN

OUT

Enable

1uF

AP7331

Fixed Output

1uF

IN

GND

EN

OUT

Enable

ADJ

R2

R1

1uF

AP7331

Adjustable Output

Pin Descriptions

Pin Name

Pin Number

Description

SOT25

(fixed)

DFN2020-6

(fixed)

SOT25

(adj)

DFN2020-6

(adj)

IN

1

3

1

3

Voltage input pin. Bypass to ground through at least

1µF capacitor

GND

2

2

2

2

Ground

EN

3

1

3

1

Enable input, active high

ADJ

-

-

4

6

Output feedback pin

NC

4

5, 6

-

5

No connection

OUT

5

4

5

4

Voltage output pin. Bypass to ground through 1µF

ceramic capacitor

Functional Block Diagram

IN

EN

GND

OUT

Gate

Driver

0.4V

Current Limit

and Thermal

Shutdown

Fixed Version

R

R

IN

EN

GND

ADJ

OUT

Gate

Driver

0.4V

Current Limit

and Thermal

Shutdown

Adjustable Version

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

+

=

2

R

1

R

1

REF

V

OUT

V