I would like to use the TPS2068 in a design that includes a USB C dual role port.
When the port is in DFP mode, the TPS2068 would be enabled and would source the 5 volt VBUS for USB C devices attached to the port.
When the port is in UFP mode, the TPS2068 would be disabled and an external DFP would supply the 5 volt VBUS.
The datasheet for the TPS2068 advertises "Reverse Current Blocking", but is this only when IN has power?
I have 2 questions:
- If an external DFP drives the OUT pins to 5 volts, while the TPS2068 is powered (IN is 5 volts but less than OUT) but disabled (EN is pulled up to 5 volts), will the TPS2068 prevent current from flowing from OUT to IN?
- If an external DFP continues to drive the OUT pins to 5 volts, and power is removed from the TPS2068 IN and the EN pullup, will the current from OUT to IN continue to be blocked?
I would like to determine if it is safe for OUT to be externally driven to 5 volts while the TPS2068 (and the rest of the design) is unpowered.
