Серия защитных ИС LT4356-1

Общие характеристики

Раздел Защитная ИС
Кол-во защищаемых линий (каналов)

Документация на серию LT4356-1

LT4356-1/LT4356-2 Surge Stopper FEATURES n n n n n n n n n n n n n DESCRIPTION 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) Auxiliary Amplifier for Level Detection Comparator or Linear Regulator Controller (LT4356-2) Adjustable Fault Timer Controls N-channel MOSFET Shutdown Pin Withstands –60V to 100V Fault Output Indication Guaranteed Operation to 125°C 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 All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including XXXXX, XXXXX. 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 auxiliary 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 for the LT4356-1 during shutdown. The LT4356-2 differs from the LT4356-1 during shutdown by reducing the quiescent current to 60µA and keeping alive the auxiliary amplifier for uses such as an undervoltage lockout or always-on regulator. TYPICAL APPLICATION 4A, 12V Overvoltage Output Regulator 10mΩ VIN 12V VOUT IRLR2908 80V INPUT SURGE 10Ω 383k VCC SNS GATE VIN 20V/DIV OUT FB IN+ 4.99k EN AOUT GND TMR VCC DC-DC CONVERTER LT4356DE 100k CTMR = 6.8µF ILOAD = 500mA 102k SHDN UNDERVOLTAGE Overvoltage Protector Regulates Output at 27V During Transient FLT 12V VOUT 20V/DIV SHDN GND FAULT 4356 TA01 27V ADJUSTABLE CLAMP 12V 100ms/DIV 4356 TA01b 0.1µF Rev. C Document Feedback For more information www.analog.com 1 PDF
Документация на семейство LT4356-1_LT4356-2 

LT4356-1/LT4356-2 (Rev. C) Surge Stopper

Дата модификации: 20.01.2021

Размер: 469.2 Кб

26 стр.

    Товары серии LT4356-1

    Наименование i Упаковка Корпус T раб
    LT4356CDE-1#TRPBF (AD) TDFN12
    LT4356CS-1#TRPBF (AD) SO-16 SOIC16
    LT4356HDE-1#PBF (AD)
    LT4356HDE-1#PBF (AD-LTC)
    LT4356HDE-1#TRPBF (AD) TDFN12

    LT4356-1 публикации

    12 октября 2021

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