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TPS63700: Vneg max current

Part Number: TPS63700
Other Parts Discussed in Thread: TPS65131, LM2611

Hi Team

Would you advise my customer's question of Vneg max current at

Vin = 3.15V, Vout = - 6.7V?

Because max current  is difficult to estimate from the below graph in datasheet.

Thanks

Best regards

Shidara

  • Hi Shidara,

    Looking at the graph, I would say at least 200 mA.

    We can also measure it in the lab, but due to the limited lab access this might take a few days, and the results would anyway have at least 10% uncertainty due to device tolerances.

    Best regards,
    Milos

  • Hi Shidara,

    We have measured the maximum output current to be around 215 mA on the EVM. You can also use Equations 3 and 4 from the datasheet to estimate the maximum output current. The equations give around 210 mA for your conditions. Please note that this is not a precise value, and you should expect at least 20% variation.

    Best regards,
    Milos

  • Hi Milos-san

    Thank you for your advise. I understood.

    My customer have to find IC that meets more than 200mA available IC with the same condition.

    I think TPS65131 is the candidate, do you know other recommendation?

    Thanks

    Best regards,

    Shidara

  • Hi Shidara,

    It looks like the TPS65131 could fit. This is a split rail converter, do you need only negative output?

    Some alternatives are:

    1. LM2611 can support up to around Iout = 350 mA for your conditions.
    2. PTN04050A is an inverting module, however it is not a low cost or a small device.
    3. Buck converter in inverting configuration, as explained here:
      http://www.ti.com/lit/an/slva542a/slva542a.pdf?ts=1588350907715
      If this is fine, I will ask buck converter experts to help you with selecting the right device.

    Best regards,
    Milos

  • Hi Shidara,

    We haven’t heard back so we're assuming this answers your question. If not, just post a reply below, or create a new thread if the thread has locked due to time-out.

    Thanks and regards,
    Milos

  • Hi Milos-san

    Thank you for your advice and sorry for my late reply.

    I need to check solution size and requirements from the customer.

    So please close this thread, I will ask further when I could get

    question from the customer.

    Thanks

    Best regards,

    Shidara