AP3428/A

Document number: DS37417 Rev. 2 - 2

2 of 13

www.diodes.com

June 2016

© Diodes Incorporated

AP3428/A

Typical Applications Circuit

R1

R2

VIN

EN

LX

FB

L1 2.2

mH

10mF

GND

10

mF

ON

OFF

C1

22pF

300k

150k

Pin Descriptions

Pin Number

Pin Name

Function

TSOT25 for

AP3428

TSOT25 for

AP3428A

U-DFN2020-6

(Type J)

1

3

2

EN

Enable control input. Force this pin voltage above 1.5V enables the

chip, and below 0.4V shuts down the device.

2

2

5

GND

Ground pin

3

5

4

LX

The drains of the internal main and synchronous power MOSFET.

4

1

3

VIN

Bias supply. Chip main power supply pin

5

4

6

FB

Feedback voltage to internal error amplifier, the threshold voltage

is 0.6V.

–

–

1

NC

NC