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TPS7A33: https://e2e.ti.com/support/power_management/linear_regulators/

David Hildebrand
Expert 4860 points
Part Number: TPS7A33

My customer has asked,

"I didn’t find any data regarding maximum allowable current which the TPS7A33 OUT pins could sink when the chip is off in TPS7A33 datasheet.

Is there any data in this regard which you could share?"

Thanks.

 

 

  • 0
    TI__Mastermind 37005 points

    Hi David,

    Linear regulators in general cannot sink current, they can only source current.

    Is your customer asking for the output impedance when the IC has no power applied?
    If so, this is not a standard measurement and that data would not be available.

    Let me know if I can provide any additional help.

    Thanks,

    - Stephen

  • 0
    TI__Genius 14245 points

    Hey David,

    The output of the TPS7A33 will not be be active when the LDO is disabled and so it will not be sinking current to the LDO's input (since this is a negative regulator). As with any LDO there will be some leakage current through the pass device, but I wouldn't expect this to exceed single digit uA at high temp (the leakage will decrease as  temperature goes down).

    If current is sinking to the Vout node while a negative LDO is off, they will need to ensure that the abs max voltages listed in the datasheet are not violated.