LTC4366-1 Datasheet | Linear Technology

LTC4366 High Voltage Surge Stopper Features nn Rugged Floating Topology nn Wide Operating Voltage Range: 9V to >500V nn Adjustable Output Clamp Voltage nn Controls N-Channel MOSFET nn Adjustable Protection Timer nn Internal 9-Second Cool-Down Timer nn Shutdown IQ < 14µA nn 8-Lead TSOT and 3mm × 2mm DFN Packages APPLICATIONS nn Industrial, Automotive and Avionic Surge Protection nn High Voltage DC Distribution nn 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 damage 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 and Thin SOT 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 IXTK90N25L2 28V 10Ω 2n F 324k VDD SD GATE LTC4366-2 OUT FB TIMER VSS BASE 1µF 46.4k VOUT 1.5A 0.47µF 12.4k 422k 436612 TA01a Overvoltage Protector Regulates Output at 43V During Transient 250V INPUT SURGE VIN 100V/DIV 28V VOUT 20V/DIV 28V 43V CLAMP 100ms/DIV 436612...