The MAX14745 is not like a traditional buck converter where the device mode depends on the load and switches between PWM and PFM (Burst) modes automatically. In these PMICs you have to select either one or the other. The load of these devices are already very small and they will not switch between PFM and continuous conduction automatically depending on the load. Therefore, it will be either Burst mode for high efficiency or continuous conduction for low EMI. There is no load dependent smart switching between the modes.