In the “Selecting the Output Capacitor” section of the datasheet it says that when using ceramic output capacitors
The ESR contributes minimally to the output voltage ripple, so an external ramp must be implemented to stabilize the system. Design the external ramp using R4, C4, and the equations above.
However, there’s no mention of R4 or C4 anywhere else in the datasheet, and the equations mentioned don’t really shed any light on the ramp design. Also, in the “Operation” section on page 18 it says
Internal ramp compensation guarantees stable operation for applications using zero-ESR ceramic output capacitors.
and later on the same page
The MPM3695-100 operates with zero-ESR ceramic output capacitors by using internal ramp compensation. A triangular RAMP signal is generated internally, then superimposed onto the FB signal.
which sounds like no external ramp compensation is needed.
So is an external ramp needed or not? If so, what’s the design process? Any help would be appreciated.