Copyright

© ANPEC Electronics Corp.

Rev. A.5 - Aug., 2013

APW7323/A

www.anpec.com.tw

5

Pin Description

Pin

NO.

SOP-8P

TDFN3x3-10

Name

Function

1

7

VCC

Signal Input. VCC supplies the control circuitry, gate drivers. Connecting a ceramic bypass

capacitor from VCC to GND to eliminate switching noise and voltage ripple on the input to

the IC.

2

8

POK

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

pulled to ground when the output voltage is not within ±

12.5% of regulation point. The POK

pin, if used, needs an external pull high resistor in the range of 30k

Ω~100kΩ.

3

9

GND

Ground. Power and signal ground.

4

10

FB

Output Feedback Input. The APW7323/A senses the feedback voltage via FB and

regulates the voltage at 0.8V. Connecting FB with a resistor-divider from the converter’s

output sets the output voltage.

5

1

EN

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

turns on the regulator, otherwise, driving it low turns it off. The EN pin is internally pulled

high via a 300kΩ resistor.

6

2,3

PGND

Power Ground.

7

4,5

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.

8

6

VIN

Power Input. VIN supplies the step-down converter switches.

9

11

Exposed

Pad

Exposed pad. Connect the exposed pad to the system ground plan with large copper area

for dissipating heat into the ambient air.