Quiescent current of NRF52840 VUSB with regulator disabled

[scao]

Hi, we are developing an application using USB with NRF52840. We want to connect to the PMID of our battery charger, which will have either USB voltage or battery voltage, and turn on the USB peripheral in software.

The datasheet says I_USB,QUIES when USB enabled is 170uA. 

Is there a figure for the quiescent current from VUSB when the USB peripheral is disabled? 

Thanks in advance.

[MartinBL]

Hi again,

I got a bit more detailed answered from the system architects:

I had a look at the design description for the POWER_USB IP.
There are two possibilities when the POWER_USB IP is disabled, depending on whether VBUS is still connected or left floating.

If VBUS is connected and POWER_USB is disabled, the quiescent current sourced by VBUS is 14.5uA typical (23.7uA worst case).
If VBUS is floating and POWER_USB is disabled, the quiescent current from VBUS is of course 0.
It's worth noting that this numbers are not reported in the PS.

I hope this addresses the customer question.
Let me know if you need more informations on this.

 

Best regards,
Martin

[ResistiveTurtle]

Hi MartinBL!

I have a related question to the VUSB quiescent current: We have a setup where the 5V supply to this pin has very limited current capability.

What is the maximum current which can go into this pin be? i.e. not only the quiscent current, but also the current where there is activity on the USB bus. I have not been able to find this information in the datasheet.