LTC4366 High Voltage Surge Stopper FEATURES DESCRIPTION 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 I < 14A LTC4366 and allows it to float up with the supply therefore, Q 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 14A 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 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