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LTC4371 withstands ±300V transients during power surges

29 Mar 2016  | Susan Nordyk

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Linear Technology has introduced the LTC4371, an ideal diode-OR controller that can withstand ±300V or higher transients in high power applications, such as telecoms, computer systems and servers and network routers and switches.

The LTC4371 provides low-loss ORing of two negative voltage supplies in 48V telecom systems. It permits seamless handoff between redundant power supplies, replacing power Schottky diodes and associated heat sinks with N-channel MOSFETs, reducing power loss and voltage drop.

The LTC4371 is designed to withstand ±300V transients experienced during lightning induced surges, load switching, or supply short-circuit. A built-in shunt regulator with low 350µA quiescent current and 100V high-impedance drain pins enable large-value external resistors to safely limit device current during such high-voltage transients.


Low 15mV forward voltage drop across the ideal diode MOSFETs minimises power dissipation in high-current applications. The linear servo technique blocks DC reverse current, while ensuring smooth current transfer during supply switchover. During an input supply short-circuit, transient reverse current is minimised by a 2A gate turn-off current. A 5mA gate pull-up current ensures rapid turn-on of the MOSFET, enabling AC rectification applications.

The LTC4371 comes in 10-pin MSOP and 3×3mm plastic DFN packages specified over the commercial and industrial temperature ranges. Prices start at $2.50 each in lots of 1,000 units.

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