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LM26480, suitable for Xilinx FPGA ?

Mehmet Akif Erol
Prodigy 50 points
Other Parts Discussed in Thread: LM26480

Hi,  we are using Artix-7 FPGA for our recent project. In order to supply FPGA and implement power-up/down sequencing we decided to go for LM26480. I made connections as follows:

1.5A DC-DC for 1V FPGA Core voltage

300 mA LDOs for 3.3V and 1.8V FPGA IO Voltages.

I didn't use the second DC-DC. FPGA core voltage tolerances is  0.95V-1.05V and 1.8V IO voltage tolerance is 1.71V-1.89V. 3 percent accuracy in datasheet may reduce 1.8V to 1.746V which is inside my voltage tolerance. My question is that would a harsher environment could risk voltage stability of my FPGA ? 

Thanks in advance for responses.

Regards,

Mehmet Akif Erol

  • 0
    TI__Expert 3370 points

    hi, not sure what you mean by "harsher environment". is core always running at 1.5A DC? or pulsing load? there should be no stability issue if the operating within datasheet..

  • 0 in reply to Sheng Jin
    Prodigy 50 points

    No,  our FPGA will draw close 1A most of the times at 1V. Let me clarify my question; LDOs have the following graphs in the datasheet :

    These guarantee that my output will not swing more than 1 percent during the entire operating temperature range. But there is no such a graph for buck converters. Could voltage change of buck outputs exceed datasheet specified 3 percent at any temperature between -40/85 degrees ? My harsh environment is mainly temperature and i am afraid to go outside FPGA's recommended core voltage region.

  • 0 in reply to Mehmet Akif Erol
    TI__Expert 3370 points

    Hi, I will check with our product team to see if the 3% is guaranteed over temp.. stay tuned