FX3 : VBUS/VBATT Power Supplies design | Cypress Semiconductor
FX3 : VBUS/VBATT Power Supplies design
I'm trying to design a board using the FX3 but I got some questions about the VBUS/VBATT supplies. I don't know how I should use it.
I want my board to run on batteries so it is not always connected to a computer through the USB3 port (it can be connected if I need to send data to my board over USB or retrieve data over USB). I think I should use VBATT but I'm not so sure.
Should I connect VBUS to the USB VBUS line and VBATT to the output of a LDO ? (I'd like to use a LDO to get the 5V voltage).
What could the power consumption be if I use almost all the IOs of the FX3 in my design ? How many mA does the LDO need to produce for the VBATT pin in order to make the FX3 working properly ?
Thanks for the feedback.