F72815

Aug, 2007

V0.14

-2-

F72815

3. Pin Configuration

4. Pin Description

Pin No

Pin Name

Description

1

BOOT

Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor between

BOOT pin and the PHASE pin. The bootstrap capacitor provides the charge to turn on

the upper MOSFET.

2

UGATE

Higher gate drive output. Connect this pin to gate of the high side MOSFET

3

VREF

Reference voltage input. The input range is 0.6V~1.8V.

4

LGATE

Lower gate drive output. Connect this pin to gate of the low side MOSFET

5

VCC

IC supply voltage. This voltage is monitored for power-on-reset purpose.

6

FB

Inverting input of the error amplifier used to compensate the feedback loop of the PWM

controller.

7

OCSET/SD

This is multi-function pin. Connecting a resistor ROCSET from this pin to PHASE, and an

internal 40uA current source from VCC. OCSET voltage can sense loading status when

low side MOSFET turn on. When OCSET voltage is under 0.15V, shut down (SD)

function will be enabled.

8

PHASE

Connect this pin to the source of the upper MOSFET and the drain of the lower MOSFET.

GND

9