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BQ24295: Integrated Boost Circuit

Adam Daluga
Expert 5900 points
Part Number: BQ24295

Hello,

I was reviewing the datasheet for the BQ24295 and it looks like there is an integrated boost circuit on the device (from PMID output I believe). Is this an 'always on' output? Do you think I could use this to bias some LEDs witha higher voltage or power some other low current circuitry at 5V?

Thanks for the help!

Best,
Adam

  • 0
    TI__Genius 10385 points

    Adam,

    I believe you are referring to the OTG operation. You cannot operate in boost mode simultaneously in buck mode. Buck mode charges the battery from VBUS. Boost mode discharges the battery to provide 5V to VBUS. The boost mode is activated when the OTG pin is High, REG01[5] = 1, and no Input source is detected at VBUS as long as the operating condition for OTG startup are met. In the event that OTG is not enabled and no VBUS is present, there would be no voltage at PMID. 

    To consistently have power at PMID, you would have to always activate OTG when no VBUS is present and ensure that the OTG conditions can be met. You should have no problem operating 5V circuitry from PMID as long as your system load is less than I_OTG (1.3A) and you limit VBUS adapters to 5V. That being said, can I ask why you do not want to use the SYS pin output?

    Thanks,

    Ricardo