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Altera_Forum
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14 years ago

Current Consumption of VCCA pin for CIII-25

Hello people, On my project, i have 8 CIII-25 fpga's running parallel. Fpgas will run over 100 MHz full performance with almost of the logic elements are used for switching. I don't k...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

VCCA is used only to supply device PLLs and it requires only a few mA. A 5A smps is wasted and I think it would introduce a lot of high frequency noise, unless you need 2.5V for other devices on your board.

If you need it only for VCCA the best solution could be use a low power linear regulator which derives 2.5V supply from 3.3V.

Current absorption from other rails will strongly depend from logic implemented in fpga (VCCint) and from number of used I/Os and their required switching speed (VCCio)