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TPS22941: Driving ON pin at 3V3 while IN at 0V

Kr_ro
Prodigy 20 points
Part Number: TPS22941


Hi,

I am unable to find conclusive information about this, I would appreciate a clarification if possible.

In my application I have a 5V regulator, and I need to individually distribute/control its output voltage to 4 separate subcircuits. A microcontroller should control the switch(es), but the microntroller is not itself powered by the 5V regulator. Instead, the microcontroller is powered by a separate 3V3 power domain which can and will be powered when the 5V is powered off.

Considering the above, is the TPS22941 tolerant of the the following scenario?

IN = 0V
ON = 3V3

Or must I add some sort of Ioff isolation between the microcontroller and the TPS?

In advance thank you for any help or suggestions.

  • +1
    TI__Mastermind 32650 points

    Hi user,

    When VIN is 0V, the device as a whole is unpowered. Any input on the ON pin will be ignored and the device will remain unpowered.

    Also, the GPIO output of an MCU is not a heavy power output and so I doubt any issues could arise.

    I do not expect this to cause any issues.

    Thanks,

    Shreyas