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TPS22913: 3.3V and 5V on TPS22913C

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: TPS22913

Hi,

Good Day.

Customer plan on using TPS22913C but he want to select either a 3.3V output or a 5V output.

Both going on the same output, so he activate either one either the other.

He is wondering if the 5V could potentially leak back into the 3.3V.

He sent his 3.3V supply as input to one TPS22913C, he send his 5V supply as input to the other TPS22913C.

Then he connect both output together so he can feed the selected voltage to whatever is connected next.

He do have control on both "Enable" signals, so he can make sure not to activate both at the same time.

Can you make sure the 5V will not leak into the 3.3V via the TPS22913C?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Genius 13300 points

    Hello Ray,

    What you are explaining is a power multiplexing application and I would recommend using a device such as TPS2116. 

    The TPS22913C device has always-enabled RCB, but it requires a 44mV-54mV drop across the FET to enable RCB which means there could be some reverse current until it activates. If you implement break-before-make logic for the ON pins to ensure the devices would never be on at the same time then it would not be an issue. This of course depends heavily on what signals you have available in your system.

    Are you prioritizing the 5V or 3.3V, or is there some other reason for switching between which one powers the output?

    Regards,

    Kalin Burnside

  • 0 in reply to Kalin Burnside
    TI__Genius 13300 points

    Hello Ray,

    As you have not replied in numerous weeks I will be closing this thread. If you still need help please create a new post.

    Regards,

    Kalin Burnside