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TIOL221: About LDO output (VOUT)?

ttd
Mastermind 9115 points

Part Number: TIOL221

Dear Technical Support Team

When the IO-Link is disconnected (LP-LM open) and the 5V input pin (V5IN) is also open,
is it acceptable to apply 3.3V to the LDO output (VOUT)?
※Please ensure the VSEL pin is floating.

This inquiry is to confirm safety during microcontroller programming
when configuring the system to feed the output from VOUT into the microcontroller.

Best Regards,

ttd

  • 0
    TI__Mastermind 36371 points

    Yes, this should be OK because the voltage on the VOUT pin is less than the abs max ratings.  I will also note that the datasheet states that when the V5IN supply is used for the LDO (i.e VSEL pin = Floating), the LDO will be disabled.  However the LP-LM supply would also be required.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Nerger
    Mastermind 9115 points

    Hi Jonathan,

    Thank you for your reply.

    >However the LP-LM supply would also be required.

    In my case , this assumes no power supply to the LP-LM. Is that not possible?

    If not, please advise if there is any workaround using an external circuit or similar.

    Best Regards,

    ttd

  • 0 in reply to ttd
    TI__Mastermind 36371 points

    Hi ttd,

    I'm sorry you didn't understand my response.  My point wast that even if LP-LM was supplied and V5IN was not, the LDO would be disabled.

    I do not see an issue with having 3.3V on the VOUT pin when the LP-LM is not supplied.

    Regards,

    Jonathan