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TPS7A4700 for Converters, Crystal and FPGA

Tom Hurst1
Prodigy 80 points
Other Parts Discussed in Thread: TPS7A8300

Hello,

I know I need to use one TPS7A4700 per converter but in regards to the FPGA I have a few questions.

1) I need to cover 12v, 2.5v and 3.3v. Could the TPS7A4700 be set to 1.2v using a ext resistor or would you recommend a different part. Clean low noise is important.

2) Can the TPS7A4700 be cascaded to cover a larger power draw?

3) Would a supercap on either or both input and output help during times of high pwr draw in addition to the recommended configuration?

The total draw is estimated at 3 watts on the FPGA for all 3 voltages. I might get by with one TPS7A4700 per voltage but not sure at this point which is why I asked questions 2 and 3.

Thank you,

Tom Hurst

  • 0
    TI__Guru 55940 points

    Hi Tom,

    1. TPS7A4700 is not able to be set using an external resistor.  TPS7A4701 which is currently product-preview will have that capability.  In the meantime would TPS7A8300 work for the 1.2V?
    2. What do you mean by cascade?  Do you mean place the parts in parallel?  This may be possible, but has not been investigated at this time.  TPS7A8300 is a higher current device and may be better suited for higher power.
    3. Placing a large capacitor on the input should have no ill effects on the application.  A supercap on the output would require more investigation.
    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    Prodigy 80 points

    Hi Ryan,

    Thank you for the input. The 8300 looks good and will go to the lower voltage. Sorry I missed that one. I think I'm going to use the eval design to try the supecap and paralleling 2 devices just to test it out. But 3ea of the 8300's at the required voltages should cover what I need for the FPGA and 1ea for the converters.

    Thank you.