historically buck regulators was designed with inductor and switching frequency to reach a inductor current ripple of 30-40%.
is it relevant for new uModules with integrated inductors? asking in a matter of EMI noise etc..
for example, in my design i use the LTM4622 uModule with 2 seperete rails (3.3 and 1.8V).
i have a system requirement to work in synchronization mode and to configure the frequency to 800kHz.
so the device theoritaclly can work with 1120-2080kHz external clock.
the problem: when in low frequency (1120kHz), the ripple for the 3.3V rail is around 76%
when in high frequency (2080kHz) the ripple for 1.8V rail is 29%.
my question is what the design goal? if the inductor is internal, can i rely on the package of the device to reduce the EMI noise with ripples above 40%?