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TPS62750: Is this chip suitable for Multi-Chemistry battery charging?

Tim van Haren
Prodigy 80 points
Part Number: TPS62750
Other Parts Discussed in Thread: BQ24105, BQ2000

Hello,

For a project I am working on at the moment, I am looking for a Multi-Chemistry compatible battery charging solution. In other words, I am looking for a battery charger where the output voltage and current can be configured by resistor values. For safety reasons, SMBus / I2C etc is not an option.

The input is a 5V, 500mA max USB connection.

The output charging voltages are: 4.2 V, 3.8V. 3.65V, 2.7V. The charging current should be limited at a value (depending on the configured battery chemistry) somewhere below 500mA.

I have seen the EVM of this product. However, in my design there is no space for such a big capacitor. Also, for obvious reasons, I do not want the output to be discharged.

Do you think this chip is suitable for this type of application?

I am looking forward to hearing from you. Thanks in advance.

Kind regards,

Felix

  • 0
    TI__Expert 7605 points

    Hi Felix,

    thank you for your question and sorry for the late answer.

    I wouldn't advise you to use TPS62750 for your application, since it is not optimized for battery management.

    Have you already taken a look to the Battery management ICs section of TI portfolio?

    Please refer to the following link: Battery Management IC | Overview | Power Management | TI.com

    Thank you and best regards,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    Prodigy 80 points

    Hi Stefano,

    Thank you for your answer.

    Yes I have been searching for Battery Charger IC's from the TI portfolio. I couldn't find one that was suitable with charging a variety of different battery chemistries. Assuming that charging a battery would only require an adjustable output voltage and a way to restrain charging current, I came down to this Buck converter. 

    Could you maybe help me find one that is suitable for my application? In my opinion, I don't think the kind of charger I am looking for is very special. However it seems hard to find.

    Thank you in advance.

    Kind regards,

    Felix

  • 0 in reply to Tim van Haren
    TI__Expert 7605 points

    Hi Felix, 

    Thank you for your answer.

    Unfortunately I don't think that the device of Buck Converters portfolio are suitable for your application.

    In order to help you, I will forward this thread to the colleagues of Battery Charging PL. I hope they will be able to find the product best suitable for your application.

    Thank you and best regards,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    TI__Guru**** 156701 points

    Hi Felix,

    Most battery chargers are designed for Li type batteries that use CC/CV profile. For different Li batteries with different termination voltages, you will need a charger with adjustable output.  For NiMH charged at currents < 0.5C, you can terminate with safety timer timeout. I recommend BQ24105.

    For NiMH charging at > 0.5C, it is recommended to terminate with -dV/dt and/or dT/dt.  The only standalone with this profile is BQ2000 family.

    Regards,

    Jeff