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TPS631000: Inquiry on No-Load Current and Low-Power IC Recommendations

kvn singh
Prodigy 30 points
Part Number: TPS631000
Other Parts Discussed in Thread: TPS63901, TPS63900

Tool/software:

Hi team,

 

TPS631000

We are using this IC in our project, and in the no-load condition, it is drawing 6.6 mA. Is this correct, or can we reduce the no-load current to microamperes (µA)? Please verify the attached schematic and let us know if there are any issues. Additionally, could you recommend any low-power ICs that draw only microamperes in a no-load condition?

 

Thank you!

 

  • +1
    TI__Mastermind 32350 points

    Hi 

    To approch a low consumption in a no load condition, device should be configured at PFM mode but not FPWM mode.

    In you schematic, Pin mode should be pulled down to GND but not Vin to let device work with PFM mode.

    Regards

    Tao

  • 0 in reply to Tao Zhang
    Prodigy 30 points

    Hi Tao Zhang,

    q1) Can we use PFM mode always, is that cause any issue in future, especially in EMI/EMC point of view is this mode is okay to use?

    q2) TPS63901, TPS63900 we are planning to use this instead of TPS631000? is this better for our application?

  • 0 in reply to kvn singh
    TI__Mastermind 32350 points

    Hi,

    PFM mode only is of course acceptable. And it should have better EMI/EMC performance because much less switching cycles.

    Yes, TPS63900 work in PFM mode in your condition automatically, no need further configuration.   But be careful that the output capability is much poorer than TPS631000.

    Regards

    Tao

  • 0 in reply to Tao Zhang
    Prodigy 30 points

    Hi Tao Zhang,

    1.Are there any drawbacks in terms of performance in PFM mode?

    2.In what situations FPWM is recommended over PFM mode?

    3.We use this in a SubGHz battery operated board. The typical current consumption of the board can be expected to be around 200-250mA for a few milliseconds. Any recommendations or dos and don'ts in such a scenario? 

    Thanks,

    kvnsingh.

  • 0 in reply to kvn singh
    TI__Mastermind 32350 points

    Hi  Kvnsingh,

    Drawbacks of PFM is higher output ripple. if you have a narrow window for Vout, please be careful. Anyway, you should check if the ripple in PFM mode is acceptable. 

    FPWM is mostly for very low ripple in light load.

    Ok. in your case, recommend TPS63900/1 because it's ultra low quiescent current.

    Regards

    Tao