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Surge stopper designed for 100V transients

Posted: 18 Jan 2012     Print Version  Bookmark and Share

Keywords:Surge stopper  N-channel MOSFET  over-current  over-voltage 

Linear Technology Corp. unveils the LT4363, an over-voltage protection controller that provides over-voltage and over-current protection to high-availability electronic systems with the help of a robust, adaptable, and space-efficient design using simple control of an N-channel MOSFET.


LT4363 is over-voltage protection controller with protection capabilities beyond 100V without sacrificing over-current protection.

The design replaces traditional protection circuitry such as bulky inductors, capacitors, fuses, and transient voltage suppressors. According to Linear, when supply voltages surge, only the controller and the MOSFET suffer the high voltage surge; downstream components can afford lower voltage ratings, thereby saving costs.

The LT4363 controller builds on Linear's first-generation LT4356 device by extending over-voltage protection capabilities beyond 100V. The LTC4363 reacts quickly to over-current and short-circuit faults at the load, limiting the current to a safe value set by a sense resistor.

Armed with a 100V maximum rating and operational capability down to 4V (cold-crank), the LT4363 is said to make for an ideal barrier against badly behaving supplies. A simple clamp on the controller supply extends protection beyond the native 100V. It even survives reversed battery connections to -60V. During voltage surges, the output is regulated to a voltage set by a resistive divider, allowing the load to operate safely and smoothly through transient events. Overvoltage and under-voltage comparator inputs ensure that the LT4363 remains off outside a user-defined voltage range. To limit the thermal stress on the power MOSFET, the LT4363 uses a VDS–accelerated fault timer. If the fault persists, a warning is issued before the MOSFET is shut off. By limiting the MOSFET gate slew-rate with a resistive-capacitive (RC) network, the controller can be adapted for inrush control in Hot Swap applications. In the shutdown state the LT4363 sips just 7µA of supply current, preserving battery life. A built-in thermal shutdown occurs around 150°C.

The LT4363 is available in two options: the LT4363-1 latches off after a fault, whereas the LT4363-2 will retry after a long cool-down period. Specified over the full commercial and industrial temperature ranges, the LT4363 is offered in 12-pin DFN (4mm x 3mm) and MSOP packages, and a 16-pin SO package with enhanced high-voltage pin spacing. Pricing begins at Rs.126.53 ($2.48) each for 1,000-piece quantities and the device is now available in production quantities.

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