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TPS659037: Power Supplies for PMIC

Ryan.Bishop
Expert 3900 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5716

Hello,

The customer and I were reviewing the document SLIU011E "TPS659037 User's Guide to Power AM572x and AM571x". They are switching to the AM5716 and now evaluating this PMIC to power the processor.

We noticed in Figure 1 of that application note that there are two discrete bucks providing 5V and 3.3V to the PMIC. The 5V buck is 5A capable and the 3.3V buck is 3A capable.

Are those two buck converters capable of supplying enough power for any AM5716 application? Or is it possible the customer's application will need higher current buck converters for the 5V and 3.3V rails (given they still follow the same configuration as Figure 1)?

I've shown them the Power Estimation Tool for the AM571x, but I think they would rather start with buck converters they know will supply enough current, and only size them lower if their application allows it.

Thank you!

Regards,
Ryan B.

  • 0
    TI__Genius 16410 points
    Hi Ryan,

    It really depends on what else the 5V and 3.3V is used for in the system. The suggested buck regulators will be enough for the processor itself - actually, the 5V rail is only used for LDO1, LDO2, and LDOUSB supplies. Together, they can supply a maximum of 700mA, so you wouldn't need all 3A just for the processor. But if you have any other loads on 5V or 3.3V that bring the total load higher than 3A or 5A, then you may need to increase these.

    For reference, the AM572x EVM uses 4A buck for both 5V and 3.3V. So I would be surprised if you needed more than 5A on the 3.3V supply for AM571x, unless you had significant extra loading besides the PMIC and processor on the 3.3V rail.

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    TI__Expert 3900 points
    Hi Karl,

    Okay great, that all makes perfect sense. Understood that the customer will have to account for their additional current draw from elsewhere in the system, but as long as those regulators can support the processor then my question is answered!

    Thanks,
    Ryan B.