LT4363HDE-1 12-Lead DFN Integrated Circuit Chip High Voltage Surge Stopper with Current Limit
The LT4363HDE-1 is a high voltage surge stopper that protects downstream loads from input transients. During an overvoltage event it regulates the gate of an external N-channel MOSFET so the output is held at a safe value, which lets the load keep working instead of being shut down.
The part operates over 4 V to 80 V and withstands surges above 80 V when the VCC clamp is used. The output clamp level is set with an external resistor divider on the FB pin, so the protected rail can be chosen for the load rather than fixed by the IC.
Overcurrent protection monitors the voltage between the SNS and OUT pins and limits the drop across the sense resistor to 50 mV typical, with a foldback level of 25 mV when the output is shorted. Response is faster than 5 microseconds, and the fault timer charges in proportion to MOSFET stress, so the pass device is protected during long overloads.
The FLT pin pulls low before the timer expires to warn of an impending power down, and if the fault persists the external MOSFET is turned off. This LT4363-1 version stays off until it is reset, while the LT4363-2 version restarts automatically after a cool-down period, keeping the retry duty cycle below 1 percent.
The LT4363HDE-1 is the high temperature grade part in the 12-Lead Plastic DFN (4mm x 3mm) package, specified from -40 to 125 degrees C. Two precision comparators monitor the input for undervoltage and overvoltage, reverse input protection extends to -60 V, and shutdown current is only 7 microamps. The part is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.
Company Profile
Shenzhen Mingjiada Electronics Co., Ltd. is an independent distributor of electronic components from established manufacturers. Founded in Shenzhen in 1996, Mingjiada has established branches in Hong Kong, Japan, Russia, and Taiwan.
Certified under ISO9001:2014 for quality management systems and ISO14001:2014 for environmental management systems. With an experienced team in sales, R&D and management, we specialize in distributing products from more than 500 established suppliers.
Adhering to the principle of "maximizing benefits for customers," we offer comprehensive product ranges and provide high-quality, responsive service through professional logistics and customer service teams.
Frequently Asked Questions
Are your LT4363HDE-1 products new stock?
Yes. Every part we ship is new stock sourced through established supply channels, with full traceability.
Which package does the LT4363HDE-1 use?
It is supplied in the 12-Lead Plastic DFN (4mm x 3mm) package, the high temperature grade version specified from -40 to 125 degrees C.
What input voltage range does the LT4363HDE-1 protect?
It operates from 4 V to 80 V and withstands surges above 80 V when the VCC clamp is used, with reverse input protection to -60 V.
How is the output clamp level set on the LT4363HDE-1?
The clamp is programmed with an external resistor divider on the FB pin, so the protected rail can be matched to the downstream load.
What happens during an overcurrent fault?
The LT4363HDE-1 is the latchoff version: the FLT pin warns first, then the MOSFET is turned off and stays off until the part is reset.
How fast does the LT4363HDE-1 limit overcurrent?
The current limit amplifier responds in less than 5 microseconds and holds the sense voltage at 50 mV typical, with foldback to 25 mV during an output short.
How do you ship my order? Is it safe?
We use express carriers including DHL, FedEx, UPS, TNT, and EMS. We can also use your preferred forwarder. Products are carefully packaged to ensure safety, and we take responsibility for any damage to your order.
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