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AM5728: PMIC spec. for AM5728

matusan
Guru 10235 points
Part Number: AM5728
Other Parts Discussed in Thread: TPS659037,

Hello, TI Experts,

 

Our customer plan to use AM5728 for their product with PMIC(TPS659037).

And they sent us the question about PMIC.

 

They found the "VCC1 spec: 3.135V-5.25V" in the below PMIC-DataSheet: "4.3 Recommended Operating Conditions"

http://www.ti.com/lit/ds/symlink/tps659037.pdf

 

But the power supply range of their board is 2.97V-3.597V.

 

Question:

  Could you tell us the recommended way of power design for AM5728?

   - Are there any other PMIC for AM5728 which can meet the their power supply spec?

 

We would appreciate if you tell us recommended way with their board power supply(2.97V-3.597V).

 

Best regards.

  • 0
    TI__Genius 13567 points

    Typical applications will use the PMIC with a 3.3V fixed supply or 5.0V fixed supply. Please share more details on the 2.97-3.597V range. Does this system have a fixed 3.3V supply anywhere?

    Regards,
    Ahmad

  • 0 in reply to Ahmad_Rashed
    TI__Genius 9655 points
    Matusumoto-san

    There are 3.3V rails required for the SoC. How are you planning to supply the SoC if the input range for the board supply is 2.97V - 3.597V?

    Are you planning on using only 1.8V, Core rails and DDR from the PMIC and handle the 3.3V for the SoC externally? We're checking with the PMIC team to understand the Vmin constraints for this system use-case.

    Regards, Siva
  • 0 in reply to sivak
    Guru 10235 points

    Hi,

    Thank you very much for your kindness.

    I really appreciate your help.

    We will ask the detail about 3.3V supply to the customer.

    And we are also waiting for the feedback from PMIC Team.

     

    Best regards,

  • 0 in reply to matusan
    Guru 10235 points
    Hi,

    Thank you very much for your kindness.
    I really appreciate your help.

    Our customer sent us the feedback from your question as below;
    - Does this system have a fixed 3.3V supply anywhere?

    They told us that their system don't have any other fixed 3.3V supply.

    Question:
    They also start to consider to add the additional power supply for PMIC(TPS659037).
    What do you think?

    We are also waiting for the feedback from PMIC Team.

    Best regards,
  • 0 in reply to matusan
    TI__Genius 10000 points
    Hi,

    I support the TPS659037 device. From the PMIC side, we recommend not going below the 3.135V minimum input voltage specified in the datasheet. This number is determined by on one of the internal oscillators that may cause a reset if the input voltage goes lower than the specified minimum voltage.

    If the you go lower than 3.135V, then it is a datasheet violation, and we cannot guarantee performance across the many units that would be in production with a potentially lower VCC1.

    I recommend using a pre-regulator that has a tighter output voltage accuracy. This will also allow you to supply any 3.3V rails of the processor with accuracy.

    Thanks,
    Nastasha
  • 0 in reply to Nastasha
    Guru 10235 points
    Hi,

    Thank you very much for your kindness.
    I really appreciate your help.

    I understand "TI recommend not going below the 3.135V minimum input voltage specified in the datasheet of TPS659037".
    And we also understand "TPS659037 is "mandated" PMIC for AM5728 from below E2E-thread which I found.
    e2e.ti.com/.../590415

    Best regards,