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Original question:

TPS659039-Q1: Power domain of TPS659039

TPS659039-Q1: Power domain of TPS659039

user3378603
Intellectual 1000 points
Part Number: TPS659039-Q1

Hi，

Questions about schematic design：

1. If the LDO_out port has no load, can I remove the decoupling capacitor of the LDO_IN port?  For example, LDO6~LDO9
2. Can I short the F22 pin and the F23 pin directly?

  • 0
    TI__Genius 12735 points

    Hello,

    I see you marked your question as being for TPS659039, however only TPS659038 has LDO6-8 available. Can you confirm which device you are using?

    Best regards,

    Layne J

  • 0 in reply to Layne J
    Intellectual 1000 points

    Hi，Layne

    Yes, The first quetion is for TPS659039, the IC part number we use is O9039A385IZWSRQ1

    LDO6-8 is just an example. LDOVRTC, LDOVANA, and LDO9 are all available channels for both 38 and 39.
    We don't need these LDO channels, I want to know if I can remove the decoupling capacitor on the channel pin and then turn off the LDO channel with software.

     

    The another quetion: 

    Can I short the F22 pin and the F23 pin directly?

     

  • 0 in reply to user3378603
    TI__Genius 12735 points

    Hello,

    LDORTC and LDOVANA must be populated for the device to function correctly. For the other LDOs you may leaving the output pins floating when not in use. Feel free to refer to the Design Checklist found here. This will contain information about what is needed for each pin when connected or not connected. 

    Can you clarify which pins you are referring to? Pin F22 and F23 do not exist for this device. I have included the pin layout below from the datasheet.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    TI__Genius 12735 points

    Hello,

    I am going to close this thread now. Please create another thread if you have questions in the future.

    Best regards,

    Layne J