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TPS25944L: Device recommendation

Jihoon Choi
Prodigy 150 points
Part Number: TPS25944L
Other Parts Discussed in Thread: LM7310, TPS25947

Tool/software:

Hi Experts.

I am planning to design hardware as shown in the diagram below.

I have a few questions regarding the design.

I couldn't find a proper place to ask about hardware recommendations and validation, so I am leaving this message here.

Q1. I would like to hear your opinion on whether there are any specific issues when designing hardware as shown in the diagram.

Q2. I would like recommendations for suitable devices for the parts marked as "① UNDEFINED", "② UNDEFINED", and "③ UNDEFINED" in the diagram.

  • ② UNDEFINED (POWER MUX) should support auto-switching and have fast switching time.
  • ①, ③ UNDEFINED (STEP DOWN) and ② UNDEFINED (POWER MUX) should all have sufficient current ratings to supply the system load without causing a voltage drop due to a lack of current or insufficient margin.
  • ①, ③ UNDEFINED (STEP DOWN) and ② UNDEFINED (POWER MUX) should all generate minimal heat during operation.

Thanks.
Have good day.

  • +1
    TI__Mastermind 39285 points

    Hi Jihoon,

    Jihoon Choi said:
    Q1. I would like to hear your opinion on whether there are any specific issues when designing hardware as shown in the diagram.

    I don't think there is any issue in this system diagram.

    Jihoon Choi said:
    ② UNDEFINED (POWER MUX) should support auto-switching and have fast switching time.

    I think your application is less than 12V, 5.5A, I think 2 chip TPS25947 should be good solution here. Do you need any other protection features if not, you can also consider LM7310 (load switch version of this device, less protection features). Please refer to PMUX section in these device datasheet.

    Jihoon Choi said:
    • ①, ③ UNDEFINED (STEP DOWN) and ② UNDEFINED (POWER MUX) should all have sufficient current ratings to supply the system load without causing a voltage drop due to a lack of current or insufficient margin.
    • ①, ③ UNDEFINED (STEP DOWN) and ② UNDEFINED (POWER MUX) should all generate minimal heat during operation.

    Regarding PMUX, it is just a switch. If you suspect power rail noise or drops, please evaluate and add required input output caps to prevent any drop. 

    Regarding Step down part recommendation, Kindly create another thread with any TI Step down device part number. That will assign the thread to correct team.

    Best Regards,
    Arush