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Original question:

TPS65218: Issue with DCDC4 startup

TPS65218: Issue with DCDC4 startup

Shinichi Inoue
Guru 21686 points
Part Number: TPS65218

Dear Specialists,

My customer's encountering the same issue.

He add a 330pF capacitor to L4A pin, became better, but not enough.

He connected 600pF capacitor,  the waveform was almost good, but not perfect.

He'd liked to know the suitable capacitance. It seems to be needed 1000pF. Is there any problem.

Also, he'd like to know the reason why does this raising waveform occur.

I appreciate your great help.

Best regards,

Shinichi

question about TPS65218 .xlsx

  • 0
    TI__Mastermind 30310 points
    Shinichi-san,

    This issue only occurred on TPS65218 -B1 silicon. The TPS65218B1 part number was changed to NRND status after those posts were resolved.

    The TPS65218D0 completely replaces the TPS65218B1 and all customers should switch to the TPS65218D0 at their earliest convenience.

    Thanks,
    Brian
  • 0 in reply to Brian Berner
    Guru 21686 points

    Hi Brian,

    Thank you for your reply.

    When I sent the revision change to the customer, the customer has aleady been in the evaluation.  

    I recognize supporting TPS65218B1 is difficult.

    Considering this point, I'll talk to change TPS65218D0 again.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi