LT4363CMS-1#PBF

LT4363 High Voltage Surge Stopper with Current Limit Features n n n n n n n n n n n n Description Withstands Surges Over 100V with VCC Clamp Wide Operating Voltage Range: 4V to 80V Adjustable Output Clamp Voltage Fast Overcurrent Limit: Less Than 5µs Reverse Input Protection to –60V Adjustable UV/OV Comparator Thresholds Low 7µA Shutdown Current Shutdown Pin Withstands –60V to 100V Adjustabl...
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LT4363 High Voltage Surge Stopper with Current Limit Features n n n n n n n n n n n n Description Withstands Surges Over 100V with VCC Clamp Wide Operating Voltage Range: 4V to 80V Adjustable Output Clamp Voltage Fast Overcurrent Limit: Less Than 5µs Reverse Input Protection to –60V Adjustable UV/OV Comparator Thresholds Low 7µA Shutdown Current Shutdown Pin Withstands –60V to 100V Adjustable Fault Timer Controls N-Channel MOSFET Less Than 1% Retry Duty Cycle During Faults, LT4363-2 Available in 12-Pin (4mm × 3mm) DFN, 12-Pin MSOP and 16-Pin SO Packages The LT®4363 surge stopper protects loads from high voltage transients. It regulates the output during an overvoltage event, such as load dump in vehicles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value allowing the loads to continue functioning. The LT4363 also monitors the voltage drop between the SNS and OUT pins to protect against overcurrent faults. An internal amplifier limits the voltage across the current sense resistor to 50mV. In either fault condition, a timer is started inversely proportional to MOSFET stress. Before the timer expires, the FLT pin pulls low to warn of an impending power down. If the condition persists, the MOSFET is turned off. The LT4363-1 remains off until reset whereas the LT4363-2 restarts after a cool down period. Two precision comparators can monitor the input supply for overvoltage (OV) and undervoltage (UV) conditions. When the potential is below the UV threshold, the external MOSFET is kept off. If the input supply voltage is above the OV threshold, the MOSFET is not allowed to turn back on. Back-to-back MOSFETs 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. Applications n n n n Automotive/Avionic/Industrial Surge Protection Hot Swap™/Live Insertion High Side Switch for Battery Powered Systems Intrinsic Safety Applications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 4A, 12V Overvoltage Output Regulator with 150V Surge Protection FDB33N25 VIN 12V 10mΩ 22µF 1k 10Ω 0.1µF 127k VCC SHDN UV 4.99k 49.9k GND TMR FLT 12V VOUT 20V/DIV SHDN GND ENOUT OV VCC DC/DC CONVERTER LT4363-2 80V INPUT SURGE CTMR = 6.8µF ILOAD = 500mA VIN 20V/DIV OUT FB SMAJ58A OUTPUT CLAMP AT 16V 57.6k GATE SNS Overvoltage Protector Regulates Output at 27V During Transient FAULT 27V ADJUSTABLE CLAMP 12V 100ms/DIV 4363 TA01b 4363 TA01 0.1µF 4363fb For more information www.linear.com/LT4363 1 PDF
Документация на серию LT4363 

LT4363 - High Voltage Surge Stopper with Current Limit

Дата модификации: 23.06.2021

Размер: 248.7 Кб

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