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LT4356IMS-3TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT4356IMS-3TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT4356-3 1 43563f APPLICATIONS FEATURES DESCRIPTION Surge Stopper with Fault Latchoff The LT®4356-3 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356-3 also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifier limits the current sense voltage to 50mV. In either fault condi- tion, a timer is started inversely proportional to MOSFET stress. If the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off, until the SHDN pin pulls low momentarily. The spare amplifier may be used as a voltage detection comparator or as a linear regulator controller driving an external PNP pass transistor. Back-to-back FETs can be used in lieu of a Schottky diode for reverse input protection, reducing voltage drop and power loss. A shutdown pin reduces the quiescent current to less than 7μA during shutdown. n Automotive/Avionic Surge Protection n Hot Swap/Live Insertion n High Side Switch for Battery Powered Systems n Intrinsic Safety Applications n Stops High Voltage Surges n Adjustable Output Clamp Voltage n Overcurrent Protection n Wide Operation Range: 4V to 80V n Reverse Input Protection to –60V n Low 7μA Shutdown Current n Adjustable Latchoff Fault Timer n Controls N-channel MOSFET n Shutdown Pin Withstands –60V to 100V n Fault Output Indication n Spare Amplifier for Level Detection Comparator or Linear Regulator Controller n Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages 4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 0.1μF 10Ω 10mΩ IRLR2908 VIN 12V 43563 TA01 LT4356DE-3 GND TMR OUT GATE SNS IN+ SHDN AOUT FAULT VOUT EN FLT UNDERVOLTAGE FB VCC DC-DC CONVERTER GND SHDN VCC 4.99k 383k 100k 102k 100ms/DIV LT4356-3TA01b VIN 20V/DIV VOUT 20V/DIV 80V INPUT SURGE CTMR = 6.8μF ILOAD = 500mA 27V ADJUSTABLE CLAMP 12V 12V TYPICAL APPLICATION |
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