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TPS25730: Powering microcontroller

Akshay Raj Gollahalli
Prodigy 50 points
Part Number: TPS25730
Other Parts Discussed in Thread: TPS25751

Tool/software:

Hi,

Is it possible to power a microcontroller from LDO_3V3 in dead battery mode?

Best wishes,
Akshay.

  • +1
    TI__Mastermind 37855 points

    Hi Akshay,

    No, we do not recommend powering an MCU from the LDO_3V3 rail. In dead battery, the PPHV rail (system side VBUS) should come up and you should be able to power the MCU from there.

    The output current from the internal LDO is max 5mA.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 50 points

    Thanks for getting back, Chris. I wanted to use an MCU to set the voltage on the TPS25730.

    Is there a way I could get them both working together? Or is there any other suggestion?

  • 0 in reply to Akshay Raj Gollahalli
    TI__Mastermind 37855 points

    Hi Akshay,

    You may have two problems here.

    1. What do you mean by "set the voltage". Are you trying to set what voltage is negotiated with an MCU? 
      1. The TPS25730 USB-C PD sink voltages are only configurable through the resistive dividers
      2. If you want a sink device that has more I2C configuration, you likely need to move to the TPS25751

      1. The TPS25730 will work without an MCU, so you can set the voltages you want to support using the ADCINx resistive dividers. Once the TPS25730 has negotiated a contract, it will close the power path and provide voltage on PPHV. You can potentially take MCU voltage off of DC-DC converters taking power from PPHV.

    Thanks and Regards,

    Chris