DATASHEET
ISL70040SEH, ISL73040SEH
Radiation Hardened Low-Side GaN FET Driver
FN8984
Rev.10.0
Jul 30, 2021
The ISL70040SEH and ISL73040SEH are low-side
drivers designed to drive enhancement mode Gallium
Nitride (GaN) FETs in isolated topologies and boost type
configurations. The drivers operate with a supply voltage
from 4.5V to 13.2V and have both inverting (INB) and
non-inverting (IN) inputs to satisfy requirements for
inverting and non-inverting gate drives with a single
device.
Features
• Wide operating voltage range of 4.5V to 13.2V
• Up to 14.7V logic inputs (regardless of V level)
DD
• Inverting and non-inverting inputs
• Optimized to drive enhancement mode GaN FETs
• Internal 4.5V regulated gate drive voltage
• Independent outputs for adjustable
turn-on/turn-off speeds
The ISL70040SEH and ISL73040SEH have a 4.5V gate
drive voltage (V
) generated using an internal
DRV
• Full military temperature range operation
regulator that prevents the gate voltage from exceeding
the maximum gate-source rating of enhancement mode
GaN FETs. The gate drive voltage also features an
Undervoltage Lockout (UVLO) protection that ignores
the inputs (IN/INB) and keeps OUTL turned on to ensure
• T = -55°C to +125°C
A
• T = -55°C to +150°C
J
• Radiation acceptance testing - ISL70040SEH
• HDR (50-300rad(Si)/s): 100krad(Si)
• LDR (0.01rad(Si)/s): 75krad(Si)
the GaN FET is in an OFF state whenever V
the UVLO threshold.
is below
DRV
The ISL70040SEH and ISL73040SEH inputs can
withstand voltages up to 14.7V regardless of the V
voltage. This allows the ISL70040SEH and
• Radiation acceptance testing - ISL73040SEH
• LDR (0.01rad(Si)/s): 75krad(Si)
DD
ISL73040SEH inputs to be connected directly to most
PWM controllers. The ISL70040SEH and ISL73040SEH
split outputs offer the flexibility to adjust the turn-on and
turn-off speed independently by adding additional
impedance to the turn-on/off paths.
• SEE hardness (see the SEE Report for details)
2
• No SEB/L LET , V = 14.7V: 86MeV•cm /mg
TH DD
2
• No SET, LET , V = 13.2V: 86MeV•cm /mg
TH
DD
• Electrically screened to DLA SMD 5962-17233
The ISL70040SEH and ISL73040SEH operate across
the military temperature range from -55°C to +125°C
and are offered in an 8 Ld hermetically sealed ceramic
Surface Mount Device (SMD) package or die form.
Applications
• Flyback and forward converters
• Boost and PFC converters
• Secondary synchronous FET drivers
12V
22V - 36V
4.8
4.7
-55°C
+25°C
4.6
4.5
4.4
4.3
4.2
12V
VDD VDRV
1
2
3
4
8
7
6
5
+125°C
ISL70023SEH
100V GaN FET
PWM
Controller
IN
OUTH
OUTL
INB
VSS
ISL7884xSEH
IS-1825BSEH
VSSP
4
5
6
7
8
9
10
11
12
13
14
ISL70040SEH/
ISL73040SEH
V
(V)
DD
Figure 1. ISL70040SEH/ISL73040SEH 8 Ld SMD Package
Figure 2. VDRV Line Regulation vs Temperature
FN8984 Rev.10.0
Jul 30, 2021
Page 1 of 19
Copyright © 2017
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