4

Functional Pin Description

UGATE (Pin 1)

Upper gate drive output. Connect to the gate of the high-side

N-Channel power MOSFET.

BOOT (Pin 2)

Floating bootstrap supply pin for the upper gate drive.

Connect the bootstrap capacitor between this pin and the

PHASE pin. The bootstrap capacitor provides the charge to

turn on the upper MOSFET. See the Bootstrap Diode and

Capacitor section under DESCRIPTION for guidance in

choosing the appropriate capacitor value.

PWM (Pin 3)

The PWM signal is the control input for the driver. The PWM

signal can enter three distinct states during operation, see the

three-state PWM Input section under DESCRIPTION for further

details. Connect this pin to the PWM output of any Intersil

multiphase controllers.

GND (Pin 4)

Ground pin. All signals are referenced to this node.

LGATE (Pin 5)

Lower gate drive output. Connect to the gate of the low-side

N-Channel power MOSFET.

VCC (Pin 6)

Connect this pin to a +5V bias supply. Place a high quality

bypass capacitor from this pin to GND.

NC (Pin 7)

No connection. Leave this pin floating.

PHASE (Pin 8)

Connect this pin to the source of the upper MOSFET and the

drain of the lower MOSFET. This pin provides a return path

for the upper gate driver.

Description

Operation

The ISL6206 dual MOSFET driver controls both high-side and

low-side N-Channel FETs from one externally provided PWM

signal.

A rising edge on PWM initiates the turn-off of the lower

MOSFET (see Timing Diagram). After a short propagation

section. Adaptive shoot-through circuitry monitors the

LGATE voltage and determines the upper gate delay time

drops below 1V. This prevents both the lower and upper

MOSFETs from conducting simultaneously or shoot-

through. Once this delay period is complete the upper gate

on.

A falling transition on PWM indicates the turn-off of the upper

MOSFET and the turn-on of the lower MOSFET. A short

shoot-through circuitry determines the lower gate delay time,

and the lower gate is allowed to rise after the upper MOSFET

gate-to-source voltage drops below 1V. The lower gate then

Timing Diagram

PWM

UGATE

LGATE

ISL6206