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Need Suggestions of Buck-Boost Type Super Capacitor Charger

Wayne Chen (Audio AE)
Genius 15950 points
Other Parts Discussed in Thread: TPS63000, TPS63050

Hi Sir,

My customer is surveying buck-boost type super-cap charger for handheld with the following configurations:

Vin = 2.5V~5.0V
Super-Cap #1: Vout = 2.7V, 100mA~200mA charging current
Super-Cap #2: Vout = 4.2V, 150mA~250mA charging current 
Super-Cap #3: Vout = 3.8V, 100mA~150mA charging current

Would you please provide recommended device part or reference design to cover three conditions above?
Small DSBGA package is preferred.

Thank you and Best regards,

Wayne Chen
09/16/2019

  • 0
    TI__Guru**** 167196 points

    Hi Wayne,

    We do not have a single chip solution for this application.  Even with a boost converter followed by a buck charger, the charge current will be impractically too low until the capacitor voltage rises above the short circuit and or precharge voltage thresholds (in the 2V range).  Can you send more detail about this application through email to me (Jeff Falin)? 

    I have forwarded this to our TPS63000 buck-boost team.  There may be a simple way to run a buck-boost converter (like TPS63050) in current limit and charge a supercap.  Since we would be limiting input current, the output charge current will not be constant across input voltage but would have a known maximum.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    TI__Genius 15950 points

    Thanks a lot, Jeff. I have sent my questions and customer's information by Email...Wayne Chen