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48V diode-OR controller replaces Schottky diodes

Posted: 17 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:dual-diode controller? Schottky controller diode? n-channel MOSFET?

Linear Technology introduced the LTC4355 dual diode-OR controller, which allows Schottky diodes to be replaced by n-channel MOSFETs in high availability systems and provides extensive fault monitoring to diagnose supply failures.

Forming the diode-OR of input supplies reduces power consumption, heat dissipation and PC board area. The wide operating range of 9V to 80V supports diode-OR applications with two positive supplies, such as a 12V distributed bus architecture or the return paths of two negative supplies, as in -48V AdvancedTCA (ATCA) applications.

Additionally, the LTC4355 monitors and separately signals several types of faultsif the input supplies are not in regulation, if the inline fuses are blown, or if the voltages across the MOSFETs are greater than the fault threshold.

In high power, high availability applications such as ATCA, where redundant supplies and redundant returns are mandated, the power and heat dissipation of OR-ing diodes can be excessive and therefore MOSFETs provide a more efficient solution. The LTC4355 provides the gate drive for external N-channel MOSFETs, fast turnoff to prevent reverse current and smooth switchover between supplies without oscillation.

The LTC4355 positive diode-OR controller complements the LTC4354 negative diode-OR controller, as well as Linear's family of Hot Swap controllers, including the LTC4252A with tight UV/OV tolerance and the LTC4261 with an internal ADC for extensive monitoring.

Specified over the commercial and industrial temperature ranges, the LTC4355 is offered in 4-by-3mm 14-lead DFN and 16-lead SOIC packages. Pricing is at $2.50 each in 1,000-piece quantities.

- eeProductCenter

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