The default output voltage options for MAX77816 are 3.3V, 3.4V, and 5V.
MAX77816BEWP+T, MAX77816CEWP+T, MAX77816DEWP+T, MAX77816EEWP+T, MAX77816FEWP+T have a 3.3V default output.
MAX77816AEWP+T has a 3.4V default output.
MAX77816CEWP+T has a 5V default output.
Note that the MAX77816CEWP+T (C version) has a DVS pin that allows the default output voltage to be set to either 3.3V or 5V.