LTC4366-1_15 Datasheet, PDF (1/24 Pages) Linear Technology – High Voltage Surge Stopper

LTC4366-1/LTC4366-2
High Voltage Surge Stopper
Features
n _{Rugged Floating Topology}
n _{Wide Operating Voltage Range: 9V to >500V}
n _{Adjustable Output Clamp Voltage}
n _{Controls N-Channel MOSFET}
n _{Adjustable Protection Timer}
n _{Internal 9 Second Cool-Down Timer}
n _{Shutdown IQ < 14µA}
n _{Available in 8-Lead TSOT and 8-Lead 3mm × 2mm}
DFN Packages
Applications
n _{Industrial, Automotive and Avionic Surge Protection}
n _{High Voltage DC Distribution}
n _{28V Vehicle Systems}
Description
The LTC^®4366 surge stopper protects loads from high
voltage transients. By controlling the gate of an external
N-channel MOSFET, the LTC4366 regulates the output
during an overvoltage transient. The load may remain
operational while the overvoltage is dropped across the
MOSFET. Placing a resistor in the return line isolates the
LTC4366 and allows it to float up with the supply; therefore,
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-
age during the surge while an additional 9 second timer
provides for MOSFET cool down. A shutdown pin reduces
the quiescent current to less than 14µA during shutdown.
After a fault the LTC4366-1 latches off while the LTC4366-2
will auto-retry.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Patents pending.
Typical Application
Overvoltage Protected 1.5A, 28V Supply
V_IN
IXTK90N25L2
28V
10Ω ^2nF
324k
V_DD
SD
GATE
LTC4366-2
OUT
FB
TIMER V_SS
BASE
1µF
46.4k
V_OUT
1.5A
0.47µF
12.4k
422k
436612 TA01a
Overvoltage Protector Regulates Output at 43V During Transient
250V INPUT SURGE
V_IN
100V/DIV
28V
V_OUT
20V/DIV ^28V
43V CLAMP
100ms/DIV
436612 TA01b
For more information www.linear.com/LTC4366
436612fd
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