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Generic Battery charging IC suggestions?

Eohan George22
Intellectual 620 points
Other Parts Discussed in Thread: TPS65100, BQ25792

Hi,

We are building a hackable and open smart battery charger https://rotoye.com/batmon/?utm_source=TI&utm_medium=forum&utm_campaign=17nov2020. We have been building this system ground up from a variable voltage current system perspective, since the existing charger ICs do not support a custom charging profile. But do you have suggestion for potential ICs that would be suited to this? 

  • 0
    TI__Mastermind 21590 points

    Hello,

    Can you provide some details on the battery chemistry, charge voltage, charge current and other system requirements.

  • 0 in reply to Raheem
    Intellectual 620 points

    The battery chemisty is LiPo, LiIon(~2-12s) and potentially NiMh.

    Charge Voltage: 6 to 53v

    Current variable limits: upto 20A

  • 0
    TI__Guru**** 165886 points

    Hi Eohan,

    You will need a dc/dc converter with 2 feedback loops, one for regulating output current and one for regulating (clamping) output voltage, like TPS65100.  The TPS65100 low-side current sense resistor is not ideal for battery charging but would work.  The TPS65100 uses boost topology but, with coupled inductor, can be used in a buck-boost SEPIC configuration.  

    Other than the Smart battery technology, what features for a custom charge profile are missing from a host controlled charger like BQ25792?  Are you trying to charge chemistries other than LiIon, like lead acid or NiMH?  Do you need more flexible low battery voltage (precharge current) levels?

    Regards,
    Jeff

  • 0 in reply to Jeff F
    Intellectual 620 points

    Jeff, 

    We are looking at a charge voltage of 6-53v (~2-12s) Lipo config. If i'm reading the datasheet right, BQ25792 and TPS65100 are for much lower voltages ? 

  • 0 in reply to Eohan George22
    TI__Guru**** 165886 points

    Hi Eohan,

    Correct.  TI Battery charge group currently does not have a device that goes that high in voltage. One of the dc/dc converter groups at TI might have a single constant voltage loop converter/controller that can reach that voltage but you will have to add additional circuitry to achieve constant current regulation.

    I suggest that you submit another e2e post asking for a dc/dc converter with 6-53V voltage range and desired output current.

    Regards,

    Jeff