Power Electronics

-48-V Diode-OR Controller

Linear Technology Corp.’s LTC4354 is a –48-V diode-OR controller for high availability systems. By controlling external N-channel MOSFETs for the redundant supply paths instead of traditional ORing diodes, it improves efficiency and eliminates bulky heat sinks. Available in a tiny 3-mm × 2-mm DFN package, the LTC4354 minimizes power dissipation due to the lower forward voltage drop and also saves vital board space.

Operating with supply voltages up to -80 V, the LTC4354 turns off the appropriate MOSFET in less than 1 µs when either power supply fails. This fast response time prevents reverse currents from reaching damaging levels. An open drain fault output, capable of driving an LED or optocoupler, indicates if either FET has excessive voltage drop. This occurs if the FET or series fuse has gone open or if there’s a supply overload.

By minimizing significant power loss and thereby increasing the system's power efficiency and reliability, the LTC4354 meets the stringent requirements of telecom standards, such as Advanced Telecom Computing Architecture (AdvancedTCA), making it suitable for a range of high availability applications.

Available from stock and specified over the commercial and industrial temperature ranges, the LTC4354 is available in 8-pin DFN and SO packages. Pricing begins at $1.95 for 1000-piece quantities.

For more information, visit www.linear.com.

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