Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Dec., 2012

APW8804

www.anpec.com.tw

8

Pin Description

PIN

NO.

TDFN3X3-10

SOP-8P

NAME

FUNCTION

1

-

NC

No Connection.

2,3

1,2

LX

Power Switching Output. LX is the Junction of the high-side and low-side Power

MOSFETs to supply power to the output LC filter.

4

3

POK

Power Good Output. This pin is open-drain logic output that is pulled to the

ground when the output voltage is out of regulation point.

5

4

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN

high to turn on the regulator, drive it low to turn it off.

6

5

FB

Output Feedback Input. The APW8804 senses the feedback voltage via FB and

regulates the voltage at 0.6V. Connecting FB with a resistor-divider from the

converter’s output sets the output voltage.

7

-

NC

No connection.

8

7

VDD

Signal Input. VDD supplies the control circuitry, gate drivers. Connecting a

ceramic bypass capacitor from VDD to GND to eliminate switching noise and

voltage ripple on the input to the IC.

9,10

8

PVDD

Power Input. PVDD supplies the step-down converter switches. Connecting a

ceramic bypass capacitor from PVDD to GND to eliminate switching noise and

voltage ripple on the input to the IC.

11

9

GND

(Exposed Pad)

Ground and Exposed pad. Connect the exposed pad to the system ground plan

with large copper area for dissipating heat into the ambient air.

-

6

GND

Ground. Power and signal ground.