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TPS650250: Any known input vulnerabilities ?

Part Number: TPS650250
Other Parts Discussed in Thread: TPS65217

Dear TI, we are using TPS650250RHBT to power a AM3352-based design, very similar to the BeagleBone. We are experiencing about a 10% failure rate in the field, where the TPS650250 dies / fails to start up / regulate - its switching output(s) stay around 0.8V - the LDO outputs make 1V8 correctly.  The TPS650250RHBT  is fed by 5V from a LM22670MR-5.0 circuit.  Are there any know issues, such as input spikes below 0V or other transient effects that might damage regulator? Why are one or more of the switching outputs affected? (usually only one of the 3 switching outputs is damaged, in our case, it is the output configured for 3V3).  Can you advise what to investigate? I look forward to your reply. Thank you. Franco

  • Franco,

    Which BeagleBone are you using? The BeagleBone Black (BEAGLEBK) uses the TPS65217 PMIC.

    I was not aware of a BeagleBone that is using the TPS650250, but I know there are other reference designs using TPS650250 to power AM335x.

    Either way, if you are having issues please provide the following:

    • Schematic (searchable PDF, not a JPG image)
    • Oscilloscope captures showing the issue occurring

    We cannot debug an issue based solely on the description of an issue.