AP3441/L

Document number: DS39754 Rev. 3 - 2

2 of 13

www.diodes.com

September 2019

© Diodes Incorporated

AP3441/L

Typical Applications Circuit

R1

R2

VIN

EN

LX

FB

L1 2.2

mH

CIN

22

mF

VIN=2.7V to 5.5V

SGND

COUT

22

mFx2

VOUT=1.8V

OFF

ON

C1

22pF

200k

Ω

100k

Ω

PG

PGND

Pin Descriptions

Pin Number

Pin Name

Function

1

FB

Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.

2

PG

Power good indicator, open drain output. PG is pulled up to VIN when the output voltage is

within 20% of the regulation level, otherwise it is low.

3

VIN

Bias supply. Chip main power supply pin

4

PGND

Power ground pin

5

NC

No connection

6

LX

The drains of the internal main and synchronous power MOSFET.

7

EN

Enable control input. Force this pin voltage above 1.5V enables the chip, and below 0.4V

shuts down the device.

8

SGND

Signal ground pin

EP

Exposed Pad

Exposed metal pad on the underside of the package without any electrical connection to

internal circuit. It is recommended to connect this pad to the PC board ground plane in order to

improve heat dissipation.