LTC4367
100V Overvoltage,
Undervoltage and Reverse
Supply Protection Controller
FEATURES DESCRIPTION
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Wide Operating Voltage Range: 2.5V to 60V The LTC 4367 protects applications where power sup-
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Overvoltage Protection to 100V ply input voltages may be too high, too low or even
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Reverse Supply Protection to 40V negative. It does this by controlling the gate voltages of
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LTC4367: Blocks 50Hz and 60Hz AC Power a pair of external N-channel MOSFETs to ensure that the
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LTC4367: 32ms Recovery from Fault output stays within a safe operating range.The LTC4367
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LTC4367-1: Fast 500s Recovery from Fault withstands voltages between 40V and 100V and has an
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No Input Capacitor or TVS Required for Most operating range of 2.5V to 60V, while consuming only
Applications 70A in normal operation.
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Adjustable Undervoltage and Overvoltage Thresholds
Two comparator inputs allow configuration of the over-
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Controls Back-to-Back N-Channel MOSFETs
voltage (OV) and undervoltage (UV) set points using an
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Low Operating Current: 70A
external resistive divider. A shutdown pin provides external
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Low Shutdown Current: 5A
control for enabling and disabling the MOSFETs as well
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8-Pin MSOP and 3mm 3mm DFN Packages
as placing the device in a low current shutdown state. A
fault output indicates that the GATE pin is pulling low when
the part is in shutdown or the input voltage is outside the
APPLICATIONS
UV and OV set points.
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Portable Instrumentation
The LTC4367 has a 32ms turn-on delay that debounces
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Industrial Automation
live connections and blocks 50Hz to 60Hz AC power. For
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Automotive Surge (Load Dump) Protection
fast recovery after faults, the LTC4367-1 has a reduced
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Network Equipment
turn-on delay of 500s.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
24V Automotive Application with +100V, 40V Protection Load Protected from Reverse and Overvoltage at V
IN
Si7942
V V
OV = 36V
IN OUT
+70V
24V 2A
UV = 7V
20V/DIV
V
IN
GATE
V V
IN OUT VALID WINDOW
464k
GND
SHDN
V
V OUT
OUT
1500k
UV
40V
FAULT
121k V
20V/DIV
IN
OV
OV = 36V
UV = 7V
29.4k GND
4367 TA01b
4367 TA01a
200ms/DIV
LTC4367
4367fb
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For more information www.linear.com/LTC4367LTC4367
ABSOLUTE MAXIMUM RATINGS
(Note 1, Note 2)
Supply Voltage Input Currents
V ........................................................ 40V to 100V SHDN, UV .........................................................1mA
IN
Input Voltages (Note 3) OV ......................................................................1mA
UV, SHDN .............................................. 0.3V to 80V Operating Ambient Temperature Range
OV ............................................................ 0.3V to 5V LTC4367C ................................................ 0C to 70C
V ....................................................... 0.3V to 80V LTC4367I .............................................40C to 85C
OUT
Output Voltages LTC4367H .......................................... 40C to 125C
FAULT ..................................................... 0.3V to 80V Storage Temperature Range .................. 65C to 150C
GATE (Note 4) ......................................... 40V to 75V Lead Temperature (Soldering, 10sec)
for MSOP Only ..................................................300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
V 1 8 GATE
IN
V 1 8 GATE
UV 2 7 V IN
OUT
9
UV 2 7 V
OUT
OV 3 6 FAULT
6
OV 3 FAULT
GND 4 5 SHDN GND 4 5 SHDN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
DD PACKAGE
T = 150C, = 160C/W
JMAX JA
8-LEAD (3mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) PCB GROUND CONNECTION OPTIONAL
T = 150C, = 43C/W, = 5.5C/W
JMAX JA JC
4367fb
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For more information www.linear.com/LTC4367