LTC4366 High Voltage Surge Stopper FEATURESDESCRIPTION n Rugged Floating Topology The LTC®4366 surge stopper protects loads from high n Wide Operating Voltage Range: 9V to >500V voltage transients. By controlling the gate of an external n Adjustable Output Clamp Voltage N-channel MOSFET, the LTC4366 regulates the output n Controls N-Channel MOSFET during an overvoltage transient. The load may remain n Adjustable Protection Timer operational while the overvoltage is dropped across the n Internal 9-Second Cool-Down Timer MOSFET. Placing a resistor in the return line isolates the n Shutdown IQ < 14µA LTC4366 and allows it to float up with the supply; therefore, n 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 n Industrial, Automotive and Avionic Surge Protection the quiescent current to less than 14µA during shutdown. n High Voltage DC Distribution After a fault the LTC4366-1 latches off while the LTC4366-2 n 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 APPLICATIONOvervoltage Protected 1.5A, 28V SupplyOvervoltage Protector Regulates Output at 43V During Transient IXTK90N25L2 VIN VOUT 28V 1.5A 250V INPUT SURGE 10Ω 2nF 0.47µF VIN 100V/DIV 324k 28V VDD GATE OUT 12.4k SD LTC4366-2 FB 43V CLAMP VOUT TIMER V 20V/DIV 28V SS BASE 422k 1µF 436612 TA01a 46.4k 100ms/DIV 436612 TA01b 436612fe 1 For more information www.linear.com/LTC4366 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Simplified Diagram Functional Diagram Operation Applications Information Package Description Typical Application Related Parts
