LT4363
High Voltage Surge
Stopper with Current Limit
Fea T Descrip T
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Withstands Surges Over 100V with V Clamp
The LT 4363 surge stopper protects loads from high voltage
CC
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Wide Operating Voltage Range: 4V to 80V
transients. It regulates the output during an overvoltage
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Adjustable Output Clamp Voltage
event, such as load dump in vehicles, by controlling the
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Fast Overcurrent Limit: Less Than 5s
gate of an external N-channel MOSFET. The output is limited
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Reverse Input Protection to 60V
to a safe value allowing the loads to continue functioning.
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Adjustable UV/OV Comparator Thresholds
The LT4363 also monitors the voltage drop between the
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Low 7A Shutdown Current
SNS and OUT pins to protect against overcurrent faults.
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Shutdown Pin Withstands 60V to 100V
An internal amplifier limits the voltage across the current
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Adjustable Fault Timer
sense resistor to 50mV. In either fault condition, a timer is
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Controls N-Channel MOSFET
started inversely proportional to MOSFET stress. Before the
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Less Than 1% Retry Duty Cycle During Faults,
timer expires, the FLT pin pulls low to warn of an impend-
LT4363-2
ing power down. If the condition persists, the MOSFET is
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Available in 12-Pin (4mm 3mm) DFN, 12-Pin
turned off. The LT4363-1 remains off until reset whereas
MSOP and 16-Pin SO Packages
the LT4363-2 restarts after a cool down period.
Two precision comparators can monitor the input supply
a T
for overvoltage (OV) and undervoltage (UV) conditions.
When the potential is below the UV threshold, the external
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Automotive/Avionic/Industrial Surge Protection
MOSFET is kept off. If the input supply voltage is above the
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Hot Swap/Live Insertion
OV threshold, the MOSFET is not allowed to turn back on.
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High Side Switch for Battery Powered Systems
Back-to-back MOSFETs can be used in lieu of a Schottky
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Intrinsic Safety Applications
diode for reverse input protection, reducing voltage drop
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No R , ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other
SENSE and power loss. A shutdown pin reduces the quiescent
trademarks are the property of their respective owners.
current to less than 7A during shutdown.
Typical a T
4A, 12V Overvoltage Output Regulator with 150V Surge Protection Overvoltage Protector Regulates
Output at 27V During Transient
10m
FDB33N25
V OUTPUT
IN
12V CLAMP
C = 6.8F
80V INPUT SURGE
TMR
22F
AT 16V
1k I = 500mA
LOAD
10
57.6k
V
IN
0.1F
V GATE SNS OUT
20V/DIV
CC
127k
FB
SMAJ58A
V
CC
SHDN
12V
4.99k
27V ADJUSTABLE CLAMP
DC/DC
UV LT4363-2
V
OUT
CONVERTER
20V/DIV
49.9k
12V
ENOUT SHDN
GND
OV FLT FAULT
4363 TA01b
GND TMR
100ms/DIV
4363 TA01
0.1F
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For more information www.linear.com/LT4363
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(Notes 1, 2)
V , SHDN, UV, OV ................................... 60V to 100V Operating Temperature Range
CC
SNS, OUT ................................................. 0.3V to 100V LT4363C .................................................. 0C to 70C
SNS to OUT ................................................. 30V to 30V LT4363I ................................................40C to 85C
GATE (Note 3) ..................................0.3V to SNS + 10V LT4363H ............................................ 40C to 125C
ENOUT, FLT .............................................. 0.3V to 100V LT4363MP ......................................... 55C to 125C
FB ............................................................. 0.3V to 5.5V Storage Temperature Range
TMR ......................................................................0.5mA DE12 .................................................. 65C to 125C
MS, SO .............................................. 65C to 150C
Lead Temperature (Soldering, 10 sec)
MS, SO .............................................................300C
p in c F T
LT4363-1 LT4363-1 LT4363-1
TOP VIEW
TOP VIEW
OUT 1 16 FB
FB 1 12 TMR
TOP VIEW
SNS 2 15 TMR
OUT 2 11 ENOUT
1
FB 12 TMR
NC 3 14 NC
SNS 3 10 FLT
OUT 2 11 ENOUT
13
GATE 4 13 ENOUT
GND SNS 3 10 FLT
GATE 4 9 GND
GATE 4 9 GND
NC 5 12 FLT
V 5 8 UV
CC V 5 8 UV
CC
V 6 11 GND
CC
SHDN 6 7 GND
SHDN 6 7 GND
NC 7 10 UV
MS PACKAGE
DE PACKAGE SHDN 8 9 GND
12-LEAD PLASTIC MSOP
12-LEAD (4mm 3mm) PLASTIC DFN
T = 125C, = 135C/W
JMAX JA
T = 125C, = 43C/W S PACKAGE
JMAX JA
EXPOSED PAD (PIN 13) IS GND, CONNECTION TO PCB 16-LEAD PLASTIC SO
OPTIONAL
T = 125C, = 80C/W
JMAX JA
LT4363-2 LT4363-2 LT4363-2
TOP VIEW
TOP VIEW
16
OUT 1 FB
FB 1 12 TMR
TOP VIEW
15
SNS 2 TMR
OUT 2 11 ENOUT
FB 1 12 TMR
14
NC 3 NC
SNS 3 10 FLT
OUT 2 11 ENOUT
13
13
GATE 4 ENOUT
GND SNS 3 10 FLT
GATE 4 9 GND
GATE 4 9 GND
12
NC 5 FLT
V 5 8 UV
CC V 5 8 UV
CC
11
V 6 GND
CC
SHDN 6 7 OV
SHDN 6 7 OV
10
NC 7 UV
MS PACKAGE
DE PACKAGE 9
SHDN 8 OV
12-LEAD PLASTIC MSOP
12-LEAD (4mm 3mm) PLASTIC DFN
T = 125C, = 135C/W
JMAX JA
T = 125C, = 43C/W S PACKAGE
JMAX JA
EXPOSED PAD (PIN 13) IS GND, CONNECTION TO PCB 16-LEAD PLASTIC SO
OPTIONAL
T = 125C, = 80C/W
JMAX JA
4363fb
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For more information www.linear.com/LT4363
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