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Dual ideal diode controller cuts 2 Schottky diodes from BOM

Posted: 19 Jun 2012 ?? ?Print Version ?Bookmark and Share

Keywords:ideal diode controller? N-channel MOSFET? LTC4353?

Linear Technology Corp. has rolled the LTC4353 dual ideal diode controller. The 0V to 18V controller can replace two high power Schottky diodes to enable low loss ORing of multiple power sources with minimal disturbance to supply voltages.

The low voltage device controls the forward voltage drop across external N-channel MOSFETs for smooth current transfer between supplies in diode-OR applications. In low voltage systems, a slow handoff between controllers results in a voltage droop during supply switchover. The The LTC4353 provides individual enable inputs that can be used to ensure priority to the main supply when supply voltages are within a MOSFET body diode drop of each other. With both enable inputs pulled low, device uses only 75?A per supply. Individual status outputs indicate whether the MOSFETs are on or off. The controller operates with supplies from 2.9V to 18V, and offers additional flexibility to control voltages down to 0V by applying an external supply.

The LTC4353 is offered in both 16-Lead MSOP and 4mm x 3mm DFN packages and is specified over the commercial and industrial temperature ranges. Pricing starts at $3.45 each in 1,000 piece quantities.

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