LT4356-3 Surge Stopper with Fault Latchoff Fe A Description n Stops High Voltage Surges The LT 4356-3 surge stopper protects loads from high n Adjustable Output Clamp Voltage voltage transients. It regulates the output during an n Overcurrent Protection overvoltage event, such as load dump in automobiles, n Wide Operation Range: 4V to 80V by controlling the gate of an external N-channel MOSFET. n Reverse Input Protection to 60V The output is limited to a safe value thereby allowing the n Low 7A Shutdown Current loads to continue functioning. The LT4356-3 also monitors n Adjustable Latchoff Fault Timer the voltage drop between the V and SNS pins to protect CC n Controls N-channel MOSFET against overcurrent faults. An internal amplifier limits n Shutdown Pin Withstands 60V to 100V the current sense voltage to 50mV. In either fault condi- n Fault Output Indication tion, a timer is started inversely proportional to MOSFET n Auxiliary Amplifier for Level Detection Comparator or stress. If the timer expires, the FLT pin pulls low to warn Linear Regulator Controller of an impending power down. If the condition persists, n Available in (4mm 3mm) 12-Pin DFN, the MOSFET is turned off, until the SHDN pin pulls low 10-Pin MSOP or 16-Pin SO Packages momentarily. The auxiliary amplifier may be used as a voltage detection Applic A comparator or as a linear regulator controller driving an external PNP pass transistor. n Automotive/Avionic Surge Protection n Hot Swap/Live Insertion Back-to-back FETs can be used in lieu of a Schottky diode n High Side Switch for Battery Powered Systems for reverse input protection, reducing voltage drop and n Intrinsic Safety Applications power loss. The SHDN input turns off the part, including the auxiliary amplifier, and reduces the quiescent current L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No R and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the SENSE to less than 7A. property of their respective owners. t Al Applic A 4A, 12V Overvoltage Output Regulator Overvoltage Protector Regulates Output at 27V During Transient 10m IRLR2908 V OUT V IN 12V C = 6.8F 80V INPUT SURGE TMR I = 500mA LOAD 10 102k V IN V SNS GATE OUT 20V/DIV CC 383k FB V CC SHDN 12V 4.99k 27V ADJUSTABLE CLAMP + DC-DC IN LT4356DE-3 V OUT CONVERTER 20V/DIV 100k 12V EN SHDN GND UNDERVOLTAGE A FLT FAULT LT4356-3TA01b OUT GND TMR 100ms/DIV 43563 TA01 0.1F 43563fc 1 For more information www.linear.com/LT4356-3 tion ypic tions turesLT4356-3 Absolute mA ximum rA (Notes 1 and 2) V , SHDN ................................................ 60V to 100V LT4356H-3 ......................................... 40C to 125C CC SNS ............................. V 30V or 60V to V + 0.3V LT4356MP-3 ...................................... 55C to 125C CC CC OUT, A , FLT, EN ..................................... 0.3V to 80V Storage Temperature Range OUT GATE (Note 3) .................................0.3V to V + 10V DE12 .................................................. 65C to 125C OUT + FB, TMR, IN ................................................ 0.3V to 6V MS, SO .............................................. 65C to 150C + A , EN, FLT, IN ..................................................3mA Lead Temperature (Soldering, 10 sec) OUT Operating Temperature Range MS, SO ............................................................. 300C LT4356C-3 ............................................... 0C to 70C LT4356I-3 ............................................ 40C to 85C p in c F A TOP VIEW TOP VIEW + 1 16 TMR IN + TMR 1 12 IN 2 15 FB NC TOP VIEW FB 2 11 A OUT 3 14 NC A OUT FB 1 10 TMR OUT 3 10 GND OUT 2 9 GND 4 13 OUT NC 13 GATE 3 8 EN GATE 4 9 EN 5 12 GATE GND SNS 4 7 FLT V 5 6 SHDN SNS 5 8 FLT CC 6 11 NC EN MS PACKAGE V 6 7 SHDN CC 7 10 SNS FLT 10-LEAD PLASTIC MSOP 8 9 V SHDN T = 125C, = 160C/W CC DE PACKAGE JMAX JA 12-LEAD (4mm 3mm) PLASTIC DFN S PACKAGE T = 125C, = 43C/W JMAX JA 16-LEAD PLASTIC SO EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL T = 150C, = 100C/W JMAX JA o r Der i n F A