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TPS65912: Unused DCDC pins

Shuhei Goto
Expert 4840 points
Part Number: TPS65912

Tool/software:

Hi team,

In case that some DCDC are unused, how should them be terminated? Also, are external components are needed?

Best regards,
Goto

  • +1
    TI__Genius 9297 points

    Hi Goto-san, 

    For an unused DCDC, the connections should be:

    • VINDCDCx should still be connected to VIN source (CIN not needed)
    • SWx pin can be left floating
    • VDCDCx should be connected to GND
    • VDCDCx_GND should be connected to GND
    • PGNDx should be connected to GND.

    It is also important to make sure that the bucks are disabled in the I2C registers, or mask the PGOOD signal so that an interrupt is not flagged for these bucks.
    The ENABLE bit of the respective DCDCx_AVS should be set to 0.
    and/or set the respective PGOOD_DCDCx_IT_MSK bit in INT_MSK3 Register to 1.

    If unable to use I2C, then the output needs to be fully populated with the external components as if it were being used.

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    TI__Expert 4840 points

    Hi Sarah,

    Thanks!

    BTW, In case that LED are unused, how should them be terminated? 

    Best reagrds,
    Goto

  • +1 in reply to Shuhei Goto
    TI__Genius 9297 points

    Hi Goto-san, 

    If LED is unused, then these three pins should all be left floating. 

    Best Regards, 
    Sarah