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Altera_Forum's avatar
Altera_Forum
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16 years ago

Voltage Regulators for Cyclone III

Hi. I want to use a LM317 regulator to feed my EP3C16Q240C8. The problem is that the minimum voltage the regulator is able to output is 1.25 V while the core voltage for the FPGA is 1.2 V. Is this s...
Altera_Forum's avatar
Altera_Forum
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16 years ago

This might work, but I would strongly urge against it, especially since you are talking about the core voltage. There is practically no margin left on the high-end of the rail. Even if regulation is perfect, the part will run warm.

Perhaps I'm a bit more conservative due to the line of work I'm in, but I try to aim for the center of the spec if possible. It's also kind of silly, since you can get 1.2V fixed linear regulators for about $1-2 capable of sourcing several amps of current.

(http://search.digikey.com/scripts/dksearch/dksus.dll?detail&name=fan1112sxct-nd)