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TPS65219: About power up sequence

teritama
Expert 2165 points
Part Number: TPS65219

Tool/software:

Hi team,

Our customer use TPS6521901 with setting that BUCK2 is not used.

In datasheet, LX_B2 connection if not used is leave floating.

Does we need change power up sequence too? In TRM of TPS6521901, the default setting of BUCK2 start up sequence is start up first after ON-request.

TRM : https://www.ti.com/lit/ug/slvuch3/slvuch3.pdf?ts=1731292385380

If don't change the setting of sequence, is it possible that this cause other output cant start up?

Best regards,

teritama

  • 0
    TI__Guru* 81034 points

    Hi Teritama,

    The sequence waits for each rail to be stable before enabling the next rail. If the components are populated on the BUCK2 output, then it should power up okay. Or BUCK2 would need to be disabled in the EEPROM settings.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Expert 2165 points

    Hi Matt-san,

    Thank you for reply. I understand if not use BUCK2. we need to set EEPROM to be disable or component(L and C) mount on LX_B2.

    If we change the EEPROM settings, do you recommend to use user programable product TPS6521905 for mass production?
    We are cocerned about there is any difference on supports terms and conditions between user programable product and pre-config product.

    If we try to hardware solution and not change the EEPROM setting. Is there more simply way than L and C mounting on LX_B2?
    The customer want to avoid to increase number of component if at all possible.

    Best regards,

    teritama

  • 0 in reply to teritama
    TI__Guru* 81034 points

    Hi Teritama,

    There are several customers using the TPS6521905 for mass production. There is a 3rd party company (Dediprog) that has been qualified by TI that has programmed this device for other customers. However, the hardware solution may be much easier. The L and C are needed to support the buck regulator circuit so the BUCK2 voltage is stable.

    Regards,

    Matt

  • 0 in reply to Matt Sunna
    Expert 2165 points

    Hi Matt-san,

    If we order to 3rd party that programing TPS6521905, is there any requirement of production volume?

    And is it same support between TPS652101 and TPS6521905 in case that we need to order failure analysis of product changed EEPROM setting?

    I understand that L and C are needed in hardware solution.

    Best regards,

    teritama

  • 0 in reply to teritama
    TI__Guru* 81034 points

    Hi Teritama-san,

    I do not think there is a volume requirement for the 3rd party, but I think the pricing is a little lower for quanity > 10k. Yes, TI will still support failure analysis on the PTS6521905.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Expert 2165 points

    Hi Matt-san,

    Thank you for your answer. I understand about pricing and TPS6521901 can be suported by TI same with TPS6521905 even in case of changed EEPROM setting.

    Best reegards,

    teritama

  • 0 in reply to teritama
    Expert 2165 points

    Hi Matt-san,

    I was typo the device number in below question.

    >And is it same support between TPS652101 and TPS6521905 in case that we need to order failure analysis of product changed EEPROM setting?

    In above question, correct device number is not TPS652101 but TPS6521901.

    Did you answered this question as TPS6521901?

    Best regards

    teritama

  • 0 in reply to teritama
    TI__Guru* 81034 points

    Yes, all devices from the TPS65219 will receive the same failure analysis support.

    Best regards,

    Matt