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BQ25622: VOTG and VBUS

Part Number: BQ25622
Other Parts Discussed in Thread: BQ25895

Hello,

I am using the BQ25622 VOTG output to power up my system when just the Battery is attached. I've read that VOTG voltage propagates also to VBUS.

1) Is this true?

2) What happens if I connect a charger while VOTG is activated?

3) Will this create a short circuit between both pins?

4) How do I prevent this situation?

Thank you

  • Hi Cant,

    1. The OTG voltage is on VBUS for BQ25622.

    2, 3. Connecting an adaptor to the OTG is to connect two converter outputs together. BQ25622 could not distinguish adaptor connection. Depending on the relative voltage level, one voltage could be the over voltage for the other source, trigging the OVP protection or switching halt.

    4. Please refer to the BQ25895, the OTG voltage is on PMID pin and Q1 is OFF during the OTG. When a adaptor is plugged in, the OTG stops. BQ25895 is for the application of power bank with two ports. 

    Regards,

    Eric