DATASHEET
ISL78424, ISL78434, ISL78444
100V Boot, 4A Peak, Half-Bridge Driver with Single PWM Input and Adaptive
Dead Time Control
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.
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
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
voltage, low r
DS(ON)
power FETs in half-bridge
topologies at high operating frequencies while providing
shoot-through protection and minimizing dead time
switching losses.
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.
FN9357
Rev.0.00
Sep 10, 2018
Features
• Patented gate-sensed adaptive dead time control
provides shoot-through protection and mimized dead
time
• 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)
• Separate source/sink pins at driver outputs
(ISL78424, ISL78434)
• Bootstrap and VDD Undervoltage Lockout (UVLO)
• Wide supply range: 8V to 18V
• Bootstrap supply maximum voltage: 100V
• Maximum phase voltage: 86V
• Minimum phase voltage: -10V
Applications
• Automotive half-bridge and 3-phase motor driver
• 12V to 24V and 12V to 48V bidirectional DC/DC
(with ISL78226, ISL78224 controllers)
• Multi-phase boost (with ISL78220 and ISL78225
controllers)
Related Literature
For a full list of related documents, visit our website:
•
ISL78424, ISL78434, ISL78444
product pages
R
SINK
V_BUS
12V
48V
C
BOOT
R
SOURCE
14
13
12
VDD
LO_H
LO_L
VSS
PWM
EN
RDT
R
SINK
R
SOURCE
VOUT
PWM
VDD
EN
RDT
PWM1
PWM2
ISL78226 PWM3
6-Phase
DC/DC PWM4
Controller PWM5
PWM6
VSS
EPAD
LO
HB
1
HO_H
2
HO_L
HS
3
4
ISL78444
HB
HO
HS
ISL78424
11
10
9
8
NC
5
NC
6
AGND
7
Phase #1
Phase #2
Phase #3
Phase #4
Phase #5
Phase #6
From
Controller
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
ISL78424, ISL78434, ISL78444
Contents
1.
1.1
1.2
1.3
1.4
2.
2.1
2.2
2.3
2.4
2.5
2.6
3.
4.
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
3
6
6
7
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Switching Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Timing Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
Single PWM or Independent HI/LI Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
ISL78424 and ISL78444 PWM Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3
ISL78434 HI/LI Lockout Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4
Separate Source and Sink Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Peak Gate Drive Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6
Shoot-Through Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.7
Shoot-Through and Dead Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8
Adaptive Dead Time Control (ADTC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9
Adaptive Dead Time and Gate Resistors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.10
Falling Thresholds for ADTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.11
Adjustable Dead Time Delay (RDT Pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.12
Integrated Bootstrap Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.13
Bootstrap Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.14
EN Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.15
UVLO Protection - VDD and Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1
5.2
5.3
5.4
5.5
5.6
Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Voltage Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bootstrap Capacitor Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gate Drive Limiting Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adaptive Dead Time Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustable Dead Time Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
20
21
21
22
23
23
23
24
25
25
26
26
27
27
28
28
28
28
29
29
29
5.
6.
7.
8.
PCB Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
FN9357 Rev.0.00
Sep 10, 2018
Page 2 of 34
ISL78424, ISL78434, ISL78444
1. Overview
1.
1.1
Overview
Block Diagrams
ISL78424
10
VDD
HB
5V
Regulator
5V
Switch
Control
HB
UVLO
Level
Shift
Gate
Drive
1M
HO_H
HO_L
5V
PWM HS
HS
Adaptive
Dead Time
160k
PWM
~6V
160k
Delay
-
+
-
+
Delay
VDD
UVLO
LO_H
Gate
Drive
100k
LO_L
EN
~6V
160k
5V
0.6V
Ref
Prog Dead
Time
RDT
AGND
VSS
Figure 3. ISL78424 Block Diagram
FN9357 Rev.0.00
Sep 10, 2018
Page 3 of 34
ISL78424, ISL78434, ISL78444
ISL78434
10
VDD
1. Overview
HB
5V
Regulator
5V
Switch
Control
HB
UVLO
Level
Shift
Gate
Drive
1M
HO_H
HO_L
LI
HI
~6V
160k
HS
HS
Delay
Adaptive
Dead Time
VDD
UVLO
LO_H
LI
~6V
160k
Delay
Gate
Drive
LO_L
100k
EN
~6V
160k
VSS
AGND
Figure 4. ISL78434 Block Diagram
FN9357 Rev.0.00
Sep 10, 2018
Page 4 of 34
ISL78424, ISL78434, ISL78444
ISL78444
10
VDD
1. Overview
HB
5V
Regulator
5V
Switch
Control
HB
UVLO
Level
Shift
Gate
Drive
1M
HO
5V
PWM HS
HS
Delay
-
+
Adaptive
Dead Time
160k
PWM
~6V
160k
VDD
UVLO
-
+
Delay
Gate
Drive
100k
LO
EN
~6V
160k
5V
0.6V
Ref
Prog Dead
Time
RDT
AGND
VSS
Figure 5. ISL78444 Block Diagram
FN9357 Rev.0.00
Sep 10, 2018
Page 5 of 34