The ISL78420 is a 100V, 2A high frequency half-bridge NMOS

FET driver with a tri-level PWM input. With an operating supply

voltage range of 8V to 14V, it supports a 114V bootstrap bias for

driving the high-side NMOS in 100V half-bridge applications. This

part is a derivative of the industrial family of HIP2120-HIP2123

100V half-bridge drivers.

This driver is designed to work in conjunction with the ISL78220

and ISL78225 “Multi-Phase Interleaved Boost PWM Controller

with Light Load Efficiency Enhancement”. It can also be used in

applications where a standard half-bridge driver is needed.

This driver has a programmable dead-time to ensure

break-before-make operation between the high-side and low-side

MOSFET. A resistor is used to set the dead-time from 35ns to

220ns.

The PWM pin’s tri-level input allows control of the high-side and

low-side drivers with a single pin. When the PWM input is at logic

high, the high-side bridge FET is turned on and the low-side FET is

off. When the input is at logic low, the low-side bridge FET is

turned on and the high-side FET is turned off. When the input

voltage is in mid-level state, both the high and low-side bridge

FETs are turned off. The enable pin (EN), when low, also turns

both bridge FETs off. This EN input can be used when the

controller driving the ISL78420 does not utilize a tri-level output.

Both PWM and EN logic inputs are VDD tolerant.

The ISL78420 is offered in a 14 Ld HTSSOP package and

complies with 100V conductor spacing per IPC-2221. The device

is Automotive AEC-Q100 qualified for the temperature range of

-40°C to +125°C.

Features

• 114VDC bootstrap supply maximum voltage

• 2A source and sink driver for 100V half-bridge NMOS FETs

• Programmable dead-time prevents shoot-through; adjustable

from 35ns to 220ns with a single resistor

• Unique tri-level PWM input logic enables phase shedding when

using multiphase PWM controllers (e.g. ISL78220/225)

• On-chip 1Ω (dynamic) bootstrap diode

• 10ns rise and fall times with 1000pF load

• 8V to 14V operating voltage range

• Supply undervoltage lockout (UVLO)

• 14 Ld HTSSOP package compliant with 100V conductor

spacing guidelines per IPC-2221

• AEC-Q100 qualified

Applications

• Automotive applications

• Multiphase boost (ISL78220/225)

• Half-bridge DC/DC converter

• Class-D amplifiers