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Altera_Forum's avatar
Altera_Forum
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14 years ago

Using LM317 to power FPGA

Analysing a couple of schematics I found out some using this device. Declared input voltage is 5..9v. Research of datasheet for LM317 shows that Vin-Vout should be >3v. Thus it will not be possible t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Yes. Typical dropout is around 1.1 V.

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Cool, thanks.

Will supplied current (1A) be enough? I was trying to run Altera's power calculation spreadsheet, but do not understand how to use it... So can not answer this question myself. Q240, in max config all pins are used bi-directionally, half of CLKs are used, reference frequency is 50MHz. Can you give any estimation on the power consumption on 3v3 power rail?