Johannes,
[quote user="Johannes Hofmann"]Is it then possible to enable the voltage just for the period of initialization of the host mode?[/quote]
No, the >= 4.4V power must be present on VBUS during the period while operating as a host. Once the VBUS is lower than 4.4V, it is the over-current condition, which causes the OTG controller leave the host mode and transition to peripheral mode.
[quote user="Johannes Hofmann"]Could you please present that problem to your design team to improve the concept of the processor?[/quote]
Yes, I will. And thank you for the feedback. But I doubt there is much TI can do to meet your requirement. The USB controller on AM335x is an OTG controller, it has to complain with the OTG Specs and satisfy the VBUS transition requirements of the Specs across the OTG host and peripheral mode, and other OTG features, such as HNP and SRP...