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TPS659037: PMIC power supply

Kzk
Genius 5785 points
Part Number: TPS659037
Other Parts Discussed in Thread: AM5728,

Hello,

I'm evaluating TPS6590376 for AM5728. It may be a condition that PMIC has been supplied 5V but has not been supplied 3.3V while I evaluate the target board. Will the condition potentially damage to PMIC? Please let me know if you have some information.

Regards,
Kazu

  • 0
    TI__Mastermind 30280 points
    Kazu,

    I have assigned this thread to the expert on the TPS659037 and he will reply to your questions as soon as possible to try to resolve your question.

    When you say 5V, are you referring to VCC1?
    And by 3.3V do you mean VIO_IN?
  • 0
    TI__Genius 16410 points
    Hello Kazu,

    It depends on which PMIC pins are supplied with 5V and 3.3V. The recommended sequence is to power VCC and SMPSx_IN first, then other supplies afterwards. If you can meet this sequence, there will be no damage to the PMIC.

    If you are doing another sequence, could you let me know what pins are supplied before VCC? Depending on which pins would be supplied before VCC, the risk to damage the part could be different.

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    Genius 5785 points

    Hello Karl,

    Thank you for the information on the PMIC input power supply sequence. Our design is based on the following. Normally, it's the recommended power supply sequence.

    TPS659037 User's Guide to Power AM572x and AM571x (SLIU011D)
    Figure 1. Processor Connection With TPS6590376ZWSR

    However, this time, PMIC has been supplied only 5V (LDO12_IN and LDOUSB_IN) by a certain evaluation and experiment, and I can understand that it's not preferable for PMIC. Thank you.

    Regards,
    Kazu