Consider my design:
Input power is either 8.4V (VBAT) or 15V (Wall Wart).
From there I need several voltages to power all the components on that board. Here is a list of voltages: 5, 3.3, 2.5, 1.85, 1.8, 1.5, 1.25, 1.2, 1.0 and 0.75.
Without going into the merits of what is required for each one of those voltages (current, noise, and etc), is there an intrinsic advantage in cascading switchers versus tying them all to one front end switcher (in this case a 5V output)? I'm mainly talking about overall efficiency, but I'm interested on other considerations.