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Designing low power consumption board (3.3V and 5V converters)

Marcin Wikiera
Prodigy 40 points
Other Parts Discussed in Thread: TPS61030, TPS62740, TLV61220, TPS61023, TPS61099

Hello, I want to make board for wireless project. Project will be powered from 2x series LR20 battery (3.2V max). Power consumtion on 3.3V is less than 0.1mA while sleeping (most of time). non sleep current max 100mA. Power consumption is 0.1mA while sleeping (most of time) and max 1A while working.  Need tips how to make it as effective as possible (optimalisation of current consumption at 0.1mA level. There are my questions:

1) Is TPS61030 good idea for this project for 3.3V and 5V? Will be it effective at 0.1mA? (can't find informations in datasheet)

2) Is it good idea to do 5V with TPS61030 and then 3.3V from 5V with TPS62740? (3.3V made from voltage after converter, it will affect quality of 3.3V?)

3) Maybe TPS61030 for 5V and TLV61220 for 3.3V is better idea?

4) What values and types of passive components would you recommend to make 3.3V and 5V LC filter after converters to get good quality voltages for MCUs?

5) Any suggestions what other converters I should choose?

Looking forward to hearing from you!

  • 0 in reply to Marcin Wikiera
    TI__Genius 9046 points

    Hi Marcin,

    We just come back from holiday. Will reply you by end of this week.

    -Wenhao

  • +1 in reply to Wenhao Wu
    TI__Genius 9046 points

    Hi Marcin,

    See my comments below:

    1) Is TPS61030 good idea for this project for 3.3V and 5V? Will be it effective at 0.1mA? (can't find informations in datasheet)

    3) Maybe TPS61030 for 5V and TLV61220 for 3.3V is better idea?

    [WW]For 3.3Vout, I would recommend you use TPS610994, which has over 92% efficiency at 0.1mA load, over 95% at 100mA load for 3.0Vin. TLV61220's current capability is marginal to support 100mA;

    For 5Vout, I would recommend you use TPS61023, which has over 93% efficiency for both 0.1mA load and 1A load under 3.0Vin;

    2) Is it good idea to do 5V with TPS61030 and then 3.3V from 5V with TPS62740? (3.3V made from voltage after converter, it will affect quality of 3.3V?)

    [WW]No, you will get worse efficiency than above recommendation;

    4) What values and types of passive components would you recommend to make 3.3V and 5V LC filter after converters to get good quality voltages for MCUs?

    [WW]Please follow datasheet recommendation. For TPS61099, 2.2uH+2*10uF is good starting point; For TPS61023, 1uH+2*22uF is needed;

     

    Additional question from me: Please confirm your LR20 battery in series voltage range. I assume it is 3.0V nominal. 

    -Wenhao

  • 0 in reply to Wenhao Wu
    Prodigy 40 points
    Wenhao Wu said:
    [WW]For 3.3Vout, I would recommend you use TPS610994, which has over 92% efficiency at 0.1mA load, over 95% at 100mA load for 3.0Vin. TLV61220's current capability is marginal to support 100mA;

    Great, thanks for advice. Since have suppiler problems can it be TPS61099 with programmed 3.3V output by myself?

    Wenhao Wu said:
    [WW]Please follow datasheet recommendation. For TPS61099, 2.2uH+2*10uF is good starting point; For TPS61023, 1uH+2*22uF is needed;

    I understand, will MCU working stable at this setup or should I upgrade filtering?

    Wenhao Wu said:
    Additional question from me: Please confirm your LR20 battery in series voltage range. I assume it is 3.0V nominal. 

    Yes, it seems 2x Varta Long Life LR20 series is 3.2V (brand new) when measured.

    Looking forward to hearing from you! :)

  • 0 in reply to Marcin Wikiera
    TI__Genius 9046 points

    Hi Marcin,

    See my reply below:

    Great, thanks for advice. Since have suppiler problems can it be TPS61099 with programmed 3.3V output by myself?

    [WW]Yes, it is fine.

    I understand, will MCU working stable at this setup or should I upgrade filtering?

    [WW]It is fine when you design per datasheet recommendation.

    -Wenhao

  • 0 in reply to Wenhao Wu
    Prodigy 40 points

    Thank you, I will upgrade layout and contact you for check :)