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bq25890H OTG regulation dropout

Nevin McCallum71
Prodigy 50 points
Other Parts Discussed in Thread: BQ25890H

The bq25890H is spec'd to drop out of OTG regulation when VBAT drops below 2.4-2.6V (when MIN_VBAT_SEL=1),

Is there any delay or deglitching of this event?

  • 0
    TI__Mastermind 25800 points
    Hey Nevin,

    There is some delay of the OTG beginning to droop.

    The charger has a about a 10ms delay before the OTG voltage begins to droop. Now, the device will try to restart OTG if VBUS comes back up.

    If that cycle (VBUS drop --> OTG droop --> VBUS rise --> OTG restart) happens 6 more times, the charger will disable Auto-restarting OTG.

    This is with a no load condition, so different loading on the OTG rails will affect the droop time.

    Just be aware that we cannot guarantee this time delay, but it should give you a rough approximation.


    Regards,
    Joel H