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Safe Discharging of supercapacitor.

Mehdi AYADI
Prodigy 40 points
Other Parts Discussed in Thread: BQ33100

Hi,

My backup power uses 2 series supercapacitors (2 x 350F 2.7v = 5.4v)

I need to modify the design in order to add a fast discharging circuit.

The discharge should be fast and safe. (less than 2-3 min).

The switching during normal use (charge and powering) is managed by a LTC3226.

Is there any IC  that I can add in order to switch on fast discharge ?

Thanks

  • 0
    TI__Intellectual 2025 points

    Hi Mehdi,

    At this time, the only solution we have for supercap management is BQ33100: https://www.ti.com/lit/ds/symlink/bq33100.pdf

    There is no discharge FET if that's what you're looking for because the part was designed so that the capacitors should be able to immediately provide power to the application if the system power gets cut off. The ability to be able to discharge supercapacitors to 0 V, unlike batteries, eliminates the need to protect the capacitors from discharging further once they reach a particular voltage level.

    Thanks,

    Rushi