• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Subscribers 63 subscribers
  • Views 186 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LP8733: AM6442 discrete power supply

Hale Tan
Intellectual 2480 points
Part Number: LP8733
Other Parts Discussed in Thread: TPS6521855, , AM6442, TPS65220, TPS65219, DP83869HM

Hi, team！

AM6442 can use LP8733 + TPS6521855 PMIC to supply power. But I also need a backup discrete power supply scheme. However, few documents mention limit current parameters, such as the maximum current required when all functions are in operation, or the demand for current at high temperatures. The amount of current required under these extreme conditions determines the choice of power supply options. I really need this kind of documentation to help me make a discrete power plan. Can you provide the corresponding materials or document please?

  • 0
    TI__Genius 15705 points

    Hi Hale,

    Thanks for reaching out! I'll let the Sitara team to comment on the AM64 max current consumption. In the meantime, I wanted to share that we have added a new PMIC power solution for the AM64 processor. It uses a single PMIC TPS65219 (or TPS65220) which is one of our newest developments and we have the AM64-SK EVM design files with this PMIC that can be shared under NDA. Feel free to take a look at the apps note below and let us know if you have any questions. 

    Link: Powering the AM64x with the TPS65220 or TPS65219 PMIC

    Thanks,

    Brenda

  • 0
    TI__Intellectual 2480 points

    Hi, Brenda! Thanks for your support! 

    It seems to be helpful, however, I don't find anything about the PHY power scheme. Does the TPS65220 or TPS65219 PMIC scheme have any documentation that contains power to the PHY?

  • 0 in reply to Hale Tan
    TI__Genius 15705 points

    Hi Hale, 

    Thanks for getting back on this. What specific information would you need for the PHY?

    In the AM64-SK EVM we have the following rails going to the Ethernet PHY: 3.3V, 2.5V and 1V. 

    The 3.3V and 2.5V could be supplied by the PMIC and the 1V from an external discrete. 

    Thanks,

    Brenda

  • 0 in reply to Brenda Diaz
    TI__Intellectual 2480 points

    Thanks for your reply！

    If PHY is DP83869HM, I still need maximum limit current parameter to design. I know little for the current required for the entire power supply design. I need documentation to support for this design.

    Regards,

    Hale

  • 0 in reply to Hale Tan
    TI__Expert 8155 points

    Hi Hale,

    I am looking into this with Brenda and will follow up shortly.

    Regards,

    Colin

  • +1 in reply to Colin Callaghan
    TI__Genius 15705 points

    Hi Hale, 

    The AM64-SK EVM uses DP83867IRRGZ which has similar power requirements compared with DP83869HM. The sequence requirements might be the only difference. Please feel free to send me an email so we can share the AM64 SK design files with the PMIC for a reference on how this was implemented. In addition to the pre-programmed TPS65219/20 devices, we will also be releasing a user programmable version that will allow customers to program the NVM in our PMIC to meet specific application requirements. We have worked very close with our processor team to make sure the TPS65219/20 PMIC meet the processor requirements including voltages, sequence, current, etc. This is now the most integrated, cost optimized PMIC solution for the AM64 processor. 

    Colin will share the information related to the AM64 current spec. 

    Thanks,

    Brenda

  • 0 in reply to Brenda Diaz
    TI__Expert 8155 points

    Hi Hale, Brenda,

    The Systems and Design Team provided the Max Current of each Power Rail of AM64, in the table below:

    Regards,

    Colin