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TPS659113 in a DM8148 design, input cap question

Bryan Busacco
Expert 1215 points


We are using the TPS659113 in a design powering a DM8148 processor.

The FULL datasheet for the TPS659113 clearly states the the cap on pin V5in should be 1uF. On the Mistral DM8148 EVAL board they did use a 1uF Tantalum cap, so they did as TI suggested in the datasheet.  Normally input caps have a much higher value!!?  Can we double check this? Also, the cap is tantalum and not ceramic, why?! We don't usually care about ESR on the input, so I'm hoping ceramic is fine. Please comment.
 
Also note that in the TPS659113 datasheet there is a reference to an EVM. On page 60 they show the top copper component placement. This would be a nice reference for us, but I do not see a EVM listed online or in TI's e-store. I think this may have been an internal prototype that was never released as a customer EVM board. Information from this board would help in our layout and component selection as well. It can also lend a clue to the 1uF cap question above. Can we easily find this documentation for the board?
 

 
 
Thank you,
 
Bryan Busacco
  • 0
    TI__Intellectual 1820 points

    Bryan,

    V5in (power supply input) capacitor is well 1uF which is different from the input capacitor Cvin. It does not seem to have any recommendation regarding tantalum or ceramic for the V5in capacitor.

    The EVM is not available. I will check if there is some guidelines available and will come back to you.

    Best regards,

    Flore