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LT4356-2 Dataheets PDF



Part Number LT4356-2
Manufacturers Intersil Corporation
Logo Intersil Corporation
Description Surge Stopper
Datasheet LT4356-2 DatasheetLT4356-2 Datasheet (PDF)

www.DataSheet4U.com LT4356-1/LT4356-2 Surge Stopper DESCRIPTION The LT®4356 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 also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifier.

  LT4356-2   LT4356-2



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www.DataSheet4U.com LT4356-1/LT4356-2 Surge Stopper DESCRIPTION The LT®4356 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 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 condition, 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. After a cool down period, the GATE pin pulls up turning on the MOSFET again. 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 for the LT4356-1 and 60μA for the LT4356-2 while keeping the reference and auxiliary amplifier functioning. FEATURES n n n n n n n n n n n n n Stops High Voltage Surges Adjustable Output Clamp Voltage Overcurrent Protection Wide Operation Range: 4V to 80V Reverse Input Protection to –60V Low 7μA Shutdown Current, LT4356-1 Adjustable Fault Timer Controls N-channel MOSFET Shutdown Pin Withstands –60V to 100V Fault Output Indication Guaranteed Operation to 125°C Spare Amplifier for Level Detection Comparator or Linear Regulator Controller Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages APPLICATIONS n n n n Automotive/Avionic Surge Protection Hot Swap/Live Insertion High Side Switch for Battery Powered Systems Intrinsic Safety Applications L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 4A, 12V Overvoltage Output Regulator VIN 12V 10mΩ IRLR2908 VOUT 80V INPUT SURGE 10Ω 383k VCC SHDN IN+ 100k EN UNDERVOLTAGE AOUT GND TMR FLT 4356 TA01 Overvoltage Protector Regulates Output at 27V During Transient CTMR = 6.8μF ILOAD = 500mA 102k OUT FB 4.99k VCC DC-DC CONVERTER SHDN GND FAULT VOUT 20V/DIV 12V 4356 TA01b SNS GATE VIN 20V/DIV 12V 27V ADJUSTABLE CLAMP LT4356DE 100ms/DIV 0.1μF 4356f 1 www.DataSheet4U.com LT4356-1/LT4356-2 Storage Temperature Range DE12 .................................................. –65°C to 125°C MS, SO .............................................. –65°C to 150°C Lead Temperature (Soldering, 10 sec) MS, SO ............................................................. 300°C ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2) VCC, SHDN ................................................ –60V to 100V SNS............................. VCC – 30V or –60V to VCC + 0.3V OUT, AOUT, FLT, EN...................................... –0.3V to 80V GATE (Note 3) .................................–0.3V to VOUT + 10V FB, TMR, IN+ ................................................ –0.3V to 6V AOUT, EN, FLT, IN+...................................................–3mA Operating Temperature Range LT4356C................................................... 0°C to 70°C LT4356I ................................................ –40°C to 85°C LT4356H ............................................ –40°C to 125°C PIN CONFIGURATION TOP VIEW TMR FB OUT GATE SNS VCC 1 2 3 4 5 6 13 12 IN+ 11 AOUT 10 GND 9 8 7 EN FLT SHDN FB OUT GATE SNS VCC 1 2 3 4 5 TOP VIEW 10 9 8 7 6 TMR GND EN FLT SHDN TMR 1 FB 2 NC 3 OUT 4 GATE 5 NC 6 SNS 7 VCC 8 TOP VIEW 16 IN+ 15 NC 14 AOUT 13 NC 12 GND 11 EN 10 FLT 9 SHDN DE PACKAGE 12-LEAD (4mm s 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 43°C/W EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 125°C, θJA = 120°C/W S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 100°C/W 4356f 2 www.DataSheet4U.com LT4356-1/LT4356-2 TAPE AND REEL LT4356CDE-1#TRPBF LT4356IDE-1#TRPBF LT4356HDE-1#TRPBF LT4356CDE-2#TRPBF LT4356IDE-2#TRPBF LT4356HDE-2#TRPBF LT4356CMS-1#TRPBF LT4356IMS-1#TRPBF LT4356HMS-1#TRPBF LT4356CS-1#TRPBF LT4356IS-1#TRPBF LT4356HS-1#TRPBF LT4356CS-2#TRPBF LT4356IS-2#TRPBF LT4356HS-2#TRPBF TAPE AND REEL LT4356CDE-1#TR LT4356IDE-1#TR LT4356HDE-1#TR LT4356CDE-2#TR LT4356IDE-2#TR LT4356HDE-2#TR LT4356CMS-1#TR LT4356IMS-1#TR LT4356HMS-1#TR LT4356CS-1#TR LT4356CS-1#TR LT4356HS-1#TR LT4356CS-2#TR LT4356IS-2#TR LT4356HS-2#TR PART MARKING* 43561 43561 43561 43562 43562 43562 LTCNS LTCNS LTCNS LT4356S-1 LT4356S-1 LT4356S-1 LT4356S-2 LT4356S-2 LT4356S-2 PART MARKING* 43561 43561 43561 43562 43562 43562 LTCNS LTCNS LTCNS LT4356S-1 LT4356S-1 LT4356S-1 LT4356S-2 LT4356S-2 LT4356S-2 PACKAGE DESCRIPTION 12-Lead (4mm × 3mm) Plastic DFN 12-Lead (4mm × 3mm) Plastic DFN 12-Lead (4mm × 3.


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