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TPS61291 Schematic Verification

Suresh Naga
Prodigy 230 points
Other Parts Discussed in Thread: CC1310

Hello!

I'm trying to power CC1310 with 2 alkaline batteries in series. I'm using a boost converter in my design to step the voltage up to 3.3V @ 0.2A. I've made this schematic. Can you please have a look at it and let me know if I made any mistake?

Suresh

  • 0
    TI__Intellectual 760 points
    Hi Suresh,

    What's your cell type (C, AA, AAA, N, and 9V)?

    Also, can you please share your BOM /datasheet for your capacitors and inductor?

    Regards,

    Aaron
  • 0
    TI__Mastermind 46905 points
    The number of EN/BYP pin should be 4. i would suggest to follow the datasheet and EVM to select the inductor and output capacitor. and the PCB layout is also very importance.
  • 0 in reply to Jasper Li
    Prodigy 230 points

    , thanks for the response.

    I've read the datasheet and as recommended in page 10, I've chosen the output cap to be 22uF. Also, in TIDU995, I see that output cap is 22uF. The Inductance of the Inductor is 3.3uH(I apologize for it not being mentioned on the schematic). Do you suggest any other values?

    I'll change the EN/BYP pin number and will strictly adhere to the layout guidelines given in datasheet.

    Suresh

  • 0 in reply to Suresh Naga
    TI__Mastermind 46905 points
    good. i don't have other suggestion.
  • 0 in reply to Aaron Jones
    Prodigy 230 points

    Aaron Jones (4615826) , Thanks for the reply.

    I apologise for the confusion. I'm using 2 AA battertes(3V input)

    Here're the part numbers for Caps and inductors.

    C22

    C23 - As suggested cap(CL21B226MQQNNNE) isn't available, I'm planning on using this

    L7

    Does everything look fine for you?

    Suresh

  • 0 in reply to Suresh Naga
    TI__Intellectual 760 points
    Suresh,

    Your capacitors look like they're sized well for the input and output. The min saturation current of the inductor is is 1.11A and the max switch current limit is 1.300, but since you aren't approaching those loads it shouldn't pose a problem in your application. As Jasper said, your schematic looks good.

    You can also use Webench to investigate other solutions, it's enabled for this device. (webench.ti.com)

    Regards,

    Aaron
  • 0 in reply to Aaron Jones
    Prodigy 230 points
    , thanks for the reply. I gave the PCBs for fabrication and will keep you posted on any new developments.

    I've used webench for this and for many other designs. Great tool, indeed!

    Suresh