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BQ33100: 9-series cell configuration?

Michael WS
Prodigy 135 points
Part Number: BQ33100

Dear TI Power management,

I would like to do the bq33100 with up to 9-series of supper capacitor, but I can't find any refence design, please share us the schematic and application how to apply to 9-series of supper capacitor.

I read in the note they said use mode stack, but not have examples.

Thanks & Best Regards,

Michael WS

  • 0
    TI__Mastermind 25955 points
    Hi Michael,

    First, setup the device for Stack mode by setting the STACK bit in the DF:Configuration:Registers:Operation Cfg Register.

    When using stack mode, care must be taken to insure that the IC pins 3(VC1), 4(VC2), 5(VC3), 6(VC4), and 7(SRP) are terminated correctly. You must insure that the differential voltage between any two of the adjacent signals does not exceed 8 V. This can be implemented with a set of two or more high-value resistors, depending on the maximum stack voltage in the application.

    For example, if a 9S stack is to be used, with maximum voltage of 24 V, you can arrange a string of four 1-MΩ resistors with high side connected to pin 3(VC1) and bottom to ground. The 18-V tap would connect to pin 4(VC2) along with a 0.1-µF capacitor to ground. Similarly, the 12-V tap would connect to pin 5(VC3) and the 6-V tap to pin 6(VC4) – each with a 0.1-µF cap to ground.

    The top of the cap stack is measured by pin 3(VC1) using a 1K series resistor and 0.1-µF cap to ground from pin 3. The low side of the cap stack should be referenced to the analog ground on pin 19 of the bq33100. In stack mode, VC5 and VC5BAL pins are not used and should be connected to Vss.

    For more information on stack mode supercapacitor connections, please refer to section 1.2 of this guide: www.ti.com/.../slua751.pdf and section 8.1.1.5 of the datasheet: www.ti.com/.../bq33100.pdf

    Sincerely,
    Bryan Kahler