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TPS65917-Q1: TPS65917-Q1 Output accuracy

Masa_0301
Intellectual 350 points
Part Number: TPS65917-Q1

Dear all

Could you give me the advise of TPS65917-Q1 output accuracy?

Our customers are considering using TPS65917-Q1 as the power supply for FPGA Core voltage.

The requirements of the FPGA are as follows

・VCC INT voltage : 0.85V

・Output accuracy：±3%(include load transiant)

The output voltage accuracy of TPS 65917-Q1 is -1%~2%, and the accuracy of Transiant is typ 3%.

Customers are concerned about whether they can realize the 3% required by FPGA.

■Question

Does Transient's accuracy of 3% also include output voltage accuracy?

If it is difficult, would you advise me If you have any other ideas.

Best regards

Masa0301

  • 0
    TI__Genius 16030 points
    Hello Oya-san,

    The TPS65917-Q1 total output accuracy of -1% / +2% is only for DC output accuracy (including load/line regulation), but does not include transient response. So the total accuracy will need to be added, like -4% / +5% for DC + transient accuracy. So I don't think it could meet +/-3% including load transient in all cases.

    Based on your use case of the FPGA (min/max load currents), you could measure the transient response of TPS65917-Q1 to see if it meets your FPGA spec. But if you have ~1A load steps, based on our testing we see ~2-3% output variation, so I'm not sure if it will meet your spec.

    You might also check with your FPGA vendor to see if +/- 3% is really needed including load transient response, that seems like a very tight voltage tolerance. If it's needed, you may need an external buck with higher switching frequency or tighter accuracy to meet the 3% total accuracy. I couldn't find any PMICs in our portfolio with +/- 3% DC + transient accuracy.

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    Intellectual 350 points
    Karl-san

    Thank you for your reply!
    I understood it. I ask to my customer really needed including load transient response.

    Best regards,
    Masa_0301