Diode-OR Controller saves power and board space.

Press Release Summary:

Available in 3 x 2 mm, 8-pin DFN and 8-pin SO packages, LTC4354 consists of -48 V diode-OR controller for high-availability systems. By controlling external N-channel MOSFETs for redundant supply paths, it improves efficiency and eliminates heat sinks. Product minimizes power dissipation due to lower forward voltage drop and conserves board space. Operating with supply voltages to -80 V, unit features 1 µs MOSFET turn-off time and open drain fault output.

Original Press Release:

-48V Diode-OR Controller Saves Power & Area

MILPITAS, CA - August, 25, 2004 - Linear Technology Corporation introduces the LTC4354, a -48V diode-OR controller for high availability systems. By controlling external N-channel MOSFETs for the redundant supply paths instead of traditional ORing diodes, it dramatically improves efficiency and eliminates bulky heat sinks. Available in a tiny 3mm by 2mm 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 -80V, the LTC4354 turns off the appropriate MOSFET in less than 1us 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 opto-coupler, indicates if either FET has excessive voltage drop. This occurs if the FET or series fuse has gone open or if there is 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 wide 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 1,000 piece quantities.

Summary of Features: LTC4354

Controls N-Channel MOSFETs

Replaces Power Schottky Diodes

1µs Turn-off Time Limits Peak Fault Current

80V Operation

Smooth Switchover Without Oscillation

No Reverse DC Current

Externally Adjustable Output Voltage

Available in 8-Pin (3mm x 2mm) DFN and 8-Pin SO Packages

Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

Note: LT, and LTC are registered trademarks of Linear Technology Corp.

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