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TPS65987D: Power supply to LDO_3V3

Koshi Ninomiya
Expert 5595 points
Part Number: TPS65987D


Hi Team,

Under VBUS2-to-PP_HV2 is used for VBUS Source and VBUS1-to-PP_HV1 is not used, when VIN_3V3 is off, LDO_3V3 is powered from VBUS2, right? Because LDO_3V3 is powered form lower one between VBUS1 and VBUS2, right?
Thank you.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Mastermind 36756 points

    Hi Ninomiya-san,

    No, the VBUS LDO will only be activated when the PD controller is acting as a sink. The PD controller will not be able to become a source if there is no VIN_3V3 present. Additionally, it is recommended to tie VBUS1 to VBUS2 as VBUS1 is used for ADC measurements on VBUS to detect Over Voltage and Under Voltage protection scenarios.

    If this answers your question, PLEASE select This resolved my issue

    Thank you,
    Eric