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BQ25504: Schematic with MPPT to micro controller.

james tong
Prodigy 30 points
Part Number: BQ25504

I am using the BQ25504 and would like an example diagram of how to use the MPPT function with a micro controller. 

Also with use of the MPPT function the first 16 seconds after an input power is present there is no output until the ref voltage is sampled. I need the BQ25504 to output some power as soon as voltage is present at the input.  Is there a way to get around this? 

Thanks

  • 0
    TI__Mastermind 21590 points
    Hi,
    There is no output power until the device exits Cold Start which is when VSTOR > 1.77V.
    Regards,
    Raheem
  • 0 in reply to Raheem
    Prodigy 30 points

    Hi, 

    Is there a way to shorten the time or get around the cold start? 

    Also once the battery is charged to above the VBAT_UV voltage will the BQ25504 stay in the Main boost charger mode even if the input power source is disconnected/lose power then reconnected?  or does the the cold start cycle have to start again even if Vstor remains above VBAT_UV?

    Thanks, 

    James 

  • 0 in reply to james tong
    TI__Mastermind 21590 points
    Hi,
    There is no way to get around cold start. The time this process takes depends on the input voltage and current. Once the battery voltage is above VBAT_UV, the FET between VBAT and VSTOR is on. This means that as long as the battery is above VBAT_UV, you wont have to go through cold start again if the input is turned on and off.
    Regards,
    Raheem