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TPS62088: IBB design existing efficiency issue

Hale Tan
Expert 3770 points
Part Number: TPS62088
Other Parts Discussed in Thread: TPS62824

Hi team,

My customer use TPS62088 to provide -2V output voltage form 3.3V input voltage and the output current is about 0.3A. And per the customer replied, the efficiency is about below 80%. It seems reasonable per the AN SNVA856B https://www.ti.com/lit/an/snva856b/snva856b.pdf?ts=1695125826738&ref_url=https%253A%252F%252Fwww.ti.com.cn%252F 

Do you have any other recommendation to help solve this case?

  • 0
    TI__Expert 3770 points

    If reducing the frequency, can it improve efficiency?

  • 0 in reply to Hale Tan
    TI__Mastermind 25430 points

    Hi Hale,

    I am working on this request.

    - Could you tell me what exactly you want to achieve here? To get better efficiency with TPS62088 or looking for a different device?

    - To generate -2Vout from 3.3Vin, you could also consider Charge Pumps.

    - What is the application?

    Regards,

    Febin

  • 0 in reply to Febin
    TI__Expert 3770 points

    Hi Febin,

    Febin said:
    To get better efficiency with TPS62088 or looking for a different device?

    We want to find a different device. The customer replied that when they use TPS62088 as IBB application, the efficiency is below 80%, about frequency or Rdson which of them is the main reason？ If we find a low frequency Buck, can we improve the efficiency?

    Febin said:
    To generate -2Vout from 3.3Vin, you could also consider Charge Pumps.

    300mA for charge pump is a little large.

    Febin said:
    What is the application?

    The application is optical module.

  • 0 in reply to Hale Tan
    TI__Mastermind 25430 points

    Hi Hale,

    A combination of -2Vout with 0.3A Iout for optical modules is not very common.

    Is it possible to share more details exactly how the CP would be implemented? Is it for Laser biasing?

    Regards,

    Febin

  • 0 in reply to Febin
    TI__Mastermind 25430 points

    Hi Hale,

    Any updates from your end?

    The efficiency numbers you shared looks realistic when using TPS62088 in an IBB config. To get a better efficiency, the losses need to be reduced.

    There could be some improvements if you change the frequency or inductor. However, this may not be a considerable change in IBB Config.

    In any case, please use our latest devices like the TPS62824/5/6 for newer designs.

    If you do not have further questions, I would like to close the thread.

    Regards,

    Febin