DATASHEET
ISL78424, ISL78434, ISL78444
100V Boot, 4A Peak, Half-Bridge Driver with Single PWM Input and Adaptive
Dead Time Control
FN9357
Rev.0.00
Sep 10, 2018
The ISL78424, ISL78434, and ISL78444 are Automotive
Grade (AEC-Q100 Grade 1) high voltage, high
frequency, half-bridge NMOS FET drivers for driving
the gates of up to 70V half-bridge topologies.
Features
• Patented gate-sensed adaptive dead time control
provides shoot-through protection and mimized dead
time
The family of half-bridge drivers feature 3A sourcing,
4A sinking peak gate drive current. The ISL78424 and
ISL78444 feature a single tri-level PWM input for
controlling both gate drivers. The ISL78434 has dual
independent inputs for controlling the high-side and
low-side driver separately. The ISL78424 and ISL78434
have independent sourcing and sinking pins for each gate
driver while ISL78444 has a single combined
• Unique tri-level PWM input for integration with
Renesas multiphase controllers (for example,
ISL78225 and ISL78226)
• 3A sourcing and 4A sinking output current
• On-chip 3Ω bootsrap FET switch
• Programmable dead time delay with single resistor
• Tri-level PWM input (ISL78424, ISL78444)
• Independent HI/LI inputs (ISL78434)
sourcing/sinking output for each gate driver.
Strong gate drive strength and the Adaptive Dead Time
(ADT) feature allow this family of drivers to switch high
• Separate source/sink pins at driver outputs
(ISL78424, ISL78434)
voltage, low r
power FETs in half-bridge
DS(ON)
topologies at high operating frequencies while providing
shoot-through protection and minimizing dead time
switching losses.
• Bootstrap and VDD Undervoltage Lockout (UVLO)
• Wide supply range: 8V to 18V
• Bootstrap supply maximum voltage: 100V
• Maximum phase voltage: 86V
The ISL78424, ISL78434, and ISL78444 are offered in a 14
Ld HTSSOP package that complies with 100V conductor
spacing per IPC-2221B. The ISL78444 is pin compatible
with the ISL78420. All devices are specified across a
wide ambient temperature range of -40°C to +140°C.
• Minimum phase voltage: -10V
Applications
• Automotive half-bridge and 3-phase motor driver
Related Literature
For a full list of related documents, visit our website:
• 12V to 24V and 12V to 48V bidirectional DC/DC
(with ISL78226, ISL78224 controllers)
• ISL78424, ISL78434, ISL78444 product pages
• Multi-phase boost (with ISL78220 and ISL78225
controllers)
V_BUS
RSINK
12V
48V
PWM
VDD
EN
LO
RSOURCE
CBOOT
VOUT
HB
14 VDD
1
2
3
4
5
6
HB
HO
HS
ISL78444
EPAD
RSOURCE
HO_H
LO_H
13
RDT
VSS
PWM1
PWM2
PWM3
PWM4
LO_L
12
HO_L
HS
ISL78226
6-Phase
DC/DC
RSINK
VSS
11
ISL78424
Phase #1
Phase #2
Phase #3
Phase #4
Phase #5
Phase #6
PWM
10
NC
Controller
PWM5
PWM6
From
Controller
EN
9
NC
AGND
RDT
8
7
Figure 1. Independent Source and Sink Outputs for
Optimizing Gate Drive Current and Adaptive Dead Time
Sensing
Figure 2. NMOS Half-Bridge Driver for 12V-48V Bi-Directional
DC/DC Controller
FN9357 Rev.0.00
Sep 10, 2018
Page 1 of 34
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