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TPS62172: Safe to apply external power onto output of voltage regulator?

mike f
Prodigy 60 points
Part Number: TPS62172

We are using this part in our design to provide 3V3 to a microcontroller. During initial programming of the microcontroller, this buck regulator will not be powered – rather we will supply 3V3 from an external source.

 

Is it acceptable/safe to put 3V3 on the output of TPS62172DSGR from an external source?

 

Thank you

-Mike

  • 0
    TI__Expert 7860 points

    Hi Mike,

    The VOS pin is rated for 7V, but the SW pin is rated for Vin+0.3V max.

    How were you planning on disabling the device?

    I would recommend pulling the EN pin low to disable the buck output and have Vin applied at the input so that the SW pin ratings are not exceeded.

    Thanks,

    Joseph