- Please let us know what is the current that you are referring to. Is it only the current from the USB host or the entire FX3 chip (assuming the case of a self powered device)?
- The core power consumption of FX3 (including VDD, AVDD, U3TX_VDDQ, U3RX_VDDQ) accounts to a maximum of 200mA whereas the USB PHY current accounts only to a maximum of 60mA. So, to reduce the power drawn from the USB host, the FX3 can be used in a self-powered configuration with the core power derived from an external power supply.
Refer to EZ-USB® FX3™ Power Consumption – KBA85505 for details on power consumption by FX3/FX3S.