ADuM3160: any problem with VBUS2 being 3.3 V?

Hi Scott, 

The VBUS pins are essentially LDO inputs. They will take the 5V power typically available with the USB bus and regulate it down to the required 3.3V for the isolator's internal circuitry. In this case, you make no external connection to the VDD pin besides the required bypass cap. 

If the application circuit will supply 3.3V, then that 3.3V supply will be connected to both the VBUS and VDD pins. In this configuration the LDO goes unused and 3.3V power will be supplied directly to the VDD pin. 

Regards,

Jason  

Hi Scott, 

The VBUS pins are essentially LDO inputs. They will take the 5V power typically available with the USB bus and regulate it down to the required 3.3V for the isolator's internal circuitry. In this case, you make no external connection to the VDD pin besides the required bypass cap. 

If the application circuit will supply 3.3V, then that 3.3V supply will be connected to both the VBUS and VDD pins. In this configuration the LDO goes unused and 3.3V power will be supplied directly to the VDD pin. 

Regards,

Jason  

Thank you!

Scott