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TPS61201 vs. TPS61025 efficiency

david sun77114
Expert 2162 points
Other Parts Discussed in Thread: TPS61200, TPS61020, TPS61201, TPS61025, TPS61070, TPS61261

Hi Chris,

this is an old topic, I am evaluating using TPS61200 to replace TPS61020, compare 1.8V input and 3.3V output.

TPS61025 is way higher than TPS61201. are these charts represent real performance? it is hard for me to make decision to lose 20% efficiency. any suggestions.

thanks,

David Sun

  • 0
    TI__Guru**** 151520 points

    I split this thread since it is on a different topic.

    Yes, the curves in the D/S are measured.

    The TPS61025 is more efficient but requires a larger solution size as well as needing ESR in the output cap.

    If you have a lower output current, then I recommend the TPS61261 or TPS61070 devices over either of these two ICs.

  • 0 in reply to Chris Glaser
    Expert 2162 points

    Hi Chris

    thank you for answer my question. our current patten is fluctuate, most of the time is only few mA. but some time ( less than 10% could go upto 100mA, may be 150mA. I am not sure I can use TPS61261.  attached is a current chart measured at 1.5V input side. our output voltage is 3.8V, so this chart devide by 2.5 will be output current.

  • 0 in reply to david sun77114
    TI__Guru**** 151520 points

    It's best if you can define how much current your load will need before you design its power supply.

    Even if it needs 150 mA, the TPS61070 can deliver this much and would be the simplest choice.