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REV. 1.0.2 8/26/04

FAN6520A

PRODUCT SPECIFICATION

Pin Configuration

FAN6520AM 8-pin SOIC Package

Pin Definitions

Pin #

Pin Name

Pin Function Description

1

BOOT

Bootstrap Supply Input. Provides a boosted voltage to the high-side MOSFET driver.

Connect to bootstrap capacitor as shown in Figure 1.

2

HDRV

High Side Gate Drive Output. Connect to the gate of the high-side power MOSFET(s).

This pin is also monitored by the adaptive shoot-through protection circuitry to determine

when the upper MOSFET has turned off.

3

GND

Ground. The signal and power ground for the IC. Tie this pin to the ground island/plane

through the lowest impedance connection available. Connect directly to source of low-side

MOSFET(s).

4

LDRV

Low Side Gate Drive Output. Connect to the gate of the low-side power MOSFET(s).

This pin is also monitored by the adaptive shoot-through protection circuitry to determine

when the lower MOSFET has turned off.

5

VCC

VCC. Provides bias power to the IC and the drive voltage for LDRV. Bypass with a ceramic

capacitor as close to this pin as possible.

6FB

Feedback. This pin is the inverting input of the internal error amplifier. Use this pin, in

combination with the COMP/OCSET pin, to compensate the voltage-control feedback loop

of the converter.

7

COMP/

OCSET/SD

COMP/OCSET/SD. This is a multiplexed pin. During operation, the output of the error

amplifier drives this pin. During a short period of time following power-on reset (POR), this

pin is used to determine the over-current threshold of the converter. Pulling COMP/OCSET

to a level below 0.8V disables the controller. Disabling the controller causes the oscillator

to stop, the HDRV and LDRV outputs to be held low, and the soft-start circuitry to re-arm.

8SW

Switch Node Input. Connect as shown in Figure 1. The SW pin provides return for the

high-side bootstrapped driver, is a sense point for the adaptive shoot-thru protection, and

FAN6520A

1

2

3

4

8

7

6

5

SW

COMP/OCSET/SD

FB

VCC

BOOT

HDRV

GND

LDRV