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LM5127-Q1: Deep Sleep Mode

Masatoshi Oguri
Expert 4780 points
Part Number: LM5127-Q1


Hello,

There is "Deep Sleep Mode". For what situation is this feature good? In what situation does the device enter this mode? 

Thank you.

Regards,

Oguri (TIJ automotive FAE)

  • 0
    TI__Guru 60621 points

    Hi Oguri-san,

    thank you for using the E2E forum:

    Deep sleep is entered when all channels are in sleep mode:

    It is used to set the current taken from the battery to a minimum.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Expert 4780 points

    Hi Stefan,

    Thank you for the prompt feedback. But I need further clarification to understand it.

    1. When VOUT1 is configured as boost, there should be no Sleep Mode available for it. So, isn't there Deep Sleep Mode when VOUT1 is boost? But, I guess when VOUT1 is in Bypass Mode, Deep Sleep Mode is still applicable.

    2. If Deep Sleep Mode is available when VOUT1 is in Bypass Mode, I would like you to confirm if my understanding is correct. I drew expected SW node waveform below with a typical configuration of VOUT1 as pre-boost, VOUT2 as 5.0V, and VOUT3 as 3.3V. I guess the Deep Sleep Mode is activated when both VOUT2 and VOUT 3 are in very light load with VOUT2 and VOUT3 are kept at the target voltage. Am I correct?

    Thank you.

    Regards,

    Oguri

     

  • 0 in reply to Masatoshi Oguri
    TI__Guru 60621 points

    Hi Oguri,

    Let me look into that and come back.

    Best regards,

     Stefan

  • +1 in reply to Stefan Schauer
    TI__Genius 11215 points

    Hello Oguri, 

    As long as the boost channel is switching there cannot be deep sleep, like you said. For point 2 you are correct. Please let us know if there are further questions. 

    Kind regards,
    EM