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TPS65911: Power output issue——Urgent Pilot Run

cayden liu
Intellectual 1276 points
Part Number: TPS65911
Other Parts Discussed in Thread: 66AK2G12

The current scheme is: SOC(66AK2G12) + PMIC (TPS65911A).

The problem is: VCC5V0_DCDC normal, VRTC is 1.8V. However, ViO does not output 3.3V normally, resulting in VDD1, VDD2 without normal output.

In addition the CVDD pin directly output 12V instead of 1V. Caused damage to 66AK2G12.

  • 0
    TI__Genius 17000 points

    Hello Liu,

    Thank you for reaching out and Happy Holidays. Please note we have limited product support available from 22-December thru 6-January. Your request has been assigned but will be delayed during this time. Please expect a response by 29 December 2023. Thank you for your patience!

    Best Regards,

    Ishtiaque Panhwar

  • +1 in reply to Ishtiaque Panhwar
    TI__Mastermind 49311 points

    Hi Cayden,

      Please answer my questions below:

    1. Is this new design or existing design but the issue just occurs now?
    2. Only one board has the issue? if not what's the ratio of the issue?
    3. It looks like the MOSFET of the CVDD was damaged; the PMIC is a controller on this rail.

    Thanks!

    Phil

      

  • 0 in reply to Phil Yi
    TI__Intellectual 1276 points

    Hi Phil,

    1.This is a new project.

    2.Five PCBs were made in Pilot Run, all of them were this problem.

    3.Judging from the test results, it was the CVDD end that burned out.

    BTW, Customers are more concerned about whether the program in EEPROM Programming is successful. They concern that the problem is caused by the control of the power sequence.

    Thanks Phil!

  • +1 in reply to cayden liu
    TI__Mastermind 49311 points

    Hi Cayden,

      Can you help customer to provide us a clear topside marking from the devices they're seeing the issue? so, we can check from its product lot information.

    Thanks!

    Phil

  • 0 in reply to Phil Yi
    TI__Intellectual 1276 points

    Hi Phil,

    Really thanks for you reply. The problem is that the wrong resistor is placed between VRTC and PWRDN. At present, the customer problem has been solved and the MCU can be powered normally.

    Thanks again！

    Cayden