AP2014/A

SYNCHRONOUS PWM CONTROLLER

AP2014/A Rev. 5

2 of 14

FEBRUARY 2009

www.diodes.com

Pin Assignment

1

2

3

4

8

7

6

5

FB

Vc

LDrv

HDrv

VCC

SS

Comp

GND

( Top View )

SOP-8L

Pin Descriptions

Pin Name

Pin No.

Description

FB

1

This pin is connected directly to the output of the switching regulator via resistor

divider to provide feedback to the Error amplifier.

Vcc

2

This pin provides biasing for the internal blocks of the IC as well as power for the

low side driver. A minimum of 1uF, high frequency capacitor must be connected

from this pin to ground to provide peak drive current capability.

LDrv

3

Output driver for the synchronous power MOSFET.

GND

4

This pin serves as the ground pin and must be connected directly to the ground

plane. A high frequency capacitor (0.1 to 1uF) must be connected from V5 and

V12 pins to this pin for noise free operation.

HDrv

5

Output driver for the high side power MOSFET.

Vc

6

This pin is connected to a voltage that must be at least 4V higher than the bus

voltage of the switcher (assuming 5V threshold MOSFET) and powers the high

side output driver. A minimum of 1uF, high frequency capacitor must be

connected from this pin to ground to provide peak drive current capability.

Comp

7

Compensation pin of the error amplifier. An external resistor and capacitor

network is typically connected from this pin to ground to provide loop

compensation.

SS

8

This pin provides soft-start for the switching regulator. An internal current source

charges an external capacitor that is connected from this pin to ground which

ramps up the output of the switching regulator, preventing it from overshooting as

well as limiting the input current. The converter can be shutdown by pulling this

pin below 0.5V.