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TPS63000 Schematic Review and suitability to provide 5.5V output?

Lee Coppins-Brown
Prodigy 110 points
Other Parts Discussed in Thread: TPS63000, TPS61251, TPS61200

Hi

We are developing a Card using TPS63000 to generate 5.5V output from a Li Ion battery input (so always a Boost circuit).  We based the schematic and PCB on the EVM.

We had some stability problems though only at very low output load which (after reading other posts on the forum) we solved by increasing our input and output capacitance.

I would be grateful for any comments on the schematic attached, in particular I wonder if the TPS63000 is well suited to generate 5.5V as this is the top of its spec.

Also should we increase L1? (It doesn’t satisfy EQN 4 in the datasheet at low battery voltage?)

Thanks in advance for any feedback or advice

Lee

TPS63000 Query.docx
  • 0
    TI__Guru**** 150900 points

    You can certainly do this but why not just use a boost converter since you will always be boosting?

    At 1.3A, your inductor is likely undersized.  As well, you will need more output capacitance due to the dc bias effect.

    The TPS61251/2 or TPS61200 are boost only options.

  • 0 in reply to Chris Glaser
    Prodigy 110 points

    Hi Chris, thanks for your prompt reply.

    We will increase our Inductor to 3.3uH and increase the Output Capacitance to at least 33uF.

    Agreed we could have used a simple Boost Converter and will consider it at next review but we already use TPS63000 elsewhere so it gave us a quick and easy solution.

     

    thanks again

     

    Lee