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BQ25710: 24V in OTG mode

M Lempens
Prodigy 10 points
Part Number: BQ25710

Hi,

I would like to use the BQ25710 battery charger to charge a 12V battery. The input voltage is 24V from an AC/DC converter but when there is no mains voltage, the system have to work on the battery voltage. 

Some parts in the system need a 24V voltage (max current @24V = 1,5A). The datasheet discribes the following about the OTG feature: "3-V to 20.8-V VOTG With 8 mV Resolution".

Is it possible to boost the OTG voltage up to 24V?

Thanks for helping

  • 0
    TI__Expert 5330 points
    The internal reference-voltage generating DAC is limited to 20.8V. The VBUS voltage that is being compared to this reference voltage is used to power the device, so attempting to divide it down would not only be fairly wasteful of power, but would be difficult to do reliably and likely to introduce other issues. I think that the 20.8V is a real limit and that you will need to use an external boost circuit if you need to run at 24V off of the battery.