LTC4366
High Voltage Surge Stopper
FEATURES DESCRIPTION
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Rugged Floating Topology The LTC 4366 surge stopper protects loads from high
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Wide Operating Voltage Range: 9V to >500V voltage transients. By controlling the gate of an external
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Adjustable Output Clamp Voltage N-channel MOSFET, the LTC4366 regulates the output
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Controls N-Channel MOSFET during an overvoltage transient. The load may remain
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Adjustable Protection Timer operational while the overvoltage is dropped across the
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Internal 9-Second Cool-Down Timer MOSFET. Placing a resistor in the return line isolates the
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Shutdown I < 14A LTC4366 and allows it to float up with the supply; therefore,
Q
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8-Lead TSOT and 3mm 2mm DFN Packages the upper limit on the output voltage depends only on the
availability of high valued resistors and MOSFET ratings.
An adjustable overvoltage timer prevents MOSFET dam-
APPLICATIONS
age during the surge while an additional 9-second timer
provides for MOSFET cool down. A shutdown pin reduces
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Industrial, Automotive and Avionic Surge Protection
the quiescent current to less than 14A during shutdown.
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High Voltage DC Distribution
After a fault the LTC4366-1 latches off while the LTC4366-2
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28V Vehicle Systems
will auto-retry.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Patents pending.
TYPICAL APPLICATION
Overvoltage Protected 1.5A, 28V Supply Overvoltage Protector Regulates Output at 43V During Transient
IXTK90N25L2
V V
IN OUT
28V 1.5A
250V INPUT SURGE
2nF V
10 0.47F
IN
100V/DIV
324k
28V
V GATE OUT
DD 12.4k
43V CLAMP
SD LTC4366-2 FB
V
OUT
28V
422k 20V/DIV
TIMER V BASE
SS
1F
436612 TA01a
436612 TA01b
100ms/DIV
46.4k
436612fe
1
For more information www.linear.com/LTC4366LTC4366
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) All voltages relative to V , unless otherwise noted.
SS
Supply Voltage (V ) ................................ 0.3V to 10V Currents
DD
Supply Voltage (OUT) ................................. 0.3V to 5V I ...................................................................10mA
VDD
I ...................................................................10mA
Input Voltages
OUT
BASE ................................................. 300A to 10A
FB .............................................. 0.3V to OUT + 0.3V
SD .......................................................10mA to 10A
TIMER ................................................... 0.3V to 3.5V
Operating Ambient Temperature Range (Note 4)
SD .......................................................... 0.3V to 10V
LTC4366C ................................................ 0C to 70C
Output Voltages
LTC4366I .............................................40C to 85C
BASE .........................................................1.5V to 4V
LTC4366H .......................................... 40C to 125C
OUT BASE ......................................... 0.3V to 5.5V
LTC4366MP ....................................... 55C to 125C
GATE (Note 3) ........................................ 0.3V to 15V
Storage Temperature Range .................. 65C to 150C
GATE OUT (Note 3) ............................. 0.3V to 10V
Lead Temperature (Soldering, 10 sec)
TSOT-23 Package Only .................................... 300C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
V 1 8 BASE
SS
V 1 8 GATE
TIMER 2 7 FB
DD
9
SD 2 7 OUT
SD OUT
3 6
TIMER 3 6 FB
V 4 5 GATE
DD
V 4 5 BASE
SS
TS8 PACKAGE
DDB PACKAGE
8-LEAD PLASTIC TSOT-23
8-LEAD (3mm 2mm) PLASTIC DFN
T = 150C, = 195C/W
JMAX JA
T = 150C,
JMAX
= 75C/W IF V IS SOLDERED TO PCB, = 135C/W IF V IS NOT SOLDERED TO PCB
JA SS JA SS
EXPOSED PAD (PIN 9), PCB V CONNECTION OPTIONAL
SS
436612fe
2
For more information www.linear.com/LTC4366