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BQ25619: Need PMID to seamlessly transition from VBUS to boost and also boost to VBUS

ROBERT BERNERT
Prodigy 30 points
Part Number: BQ25619

I need to have the voltage at PMID change seamlessly when the 25619 is in boost mode and I plug in VBUS and again when I unplug VBIS and boost mode is restarted

The data sheet for BQ25619 figures 41 and 42 show the characteristics I am trying to avoid   In figure 41, I see that VPMID_GOOD goes low indicating that VPMID dropped out for 300ms when VBUS was plugged in while PMID was receiving power from the boost regulator.  I need VPMID to be good when VBUS gets plugged in.  in other words need PMID to go directly from Vboost to VBUS.  Figure 42 shows that VPMID_GOOD goes low for 50ms when VBUS is unplugged.  Again I need VPMID to be good when VBUS is disconnected.  I would like seamless transition at PMID between boost mode and VBUS whether VBUS is being connected to the 25619 or VBUS is being unplugged from the charger.  IF the 25619 can not provide the seamless transition can anyone recommend a battery charger that can

 

 

  

  • 0
    TI__Mastermind 25800 points

    Hey Robert,

    Currently, our chargers that operate in reverse OTG mode or boost mode cannot provide a seamless transition between modes. The device that has the fastest transition between modes is ~15ms, which is still too long for most load conditions (would require a significant amount of capacitance). 

    Regards,

    Joel H