AP3428/A

Document number: DS37417 Rev. 5 - 2

2 of 14

www.diodes.com

May 2021

© Diodes Incorporated

AP3428/A

Typical Applications Circuit

R1

R2

VIN

EN

LX

FB

L1 2.2

mH

CIN

10mF

VIN=2.5V to 5.5V

GND

COUT

10

mF

VOUT=1.8V

ON

OFF

C1

22pF

300k

150k

Pin Descriptions

Pin Number

Pin

Name

Function

TSOT25/ TSOT25

(Type SM)

for AP3428

TSOT25/ TSOT25

(Type SM)

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