The LT3071 datasheet provides a good description of the VIOS mode and an sample design using this device with the LTC3415EUHF. The LT3071 data sheet (page 17) says "It typically regulates the output of most LTC switching regulators or LTM power modules, by sinking current from the Ith compensation node". Does that mean VIOS can be configured to work with LTC3416? This IC does have an Ith pin, but there is not really enough information in the datasheet to be certain this will work. If this will work, its not clear how to tune the compensate newtork. The LT3071 datasheet provides some useful specs on the VIOS output, but its not clear (to me) what the LTC3416 requires from the compensation.