I am reusing the MPM3610A for our next design. The only difference is the value of output capacitance. To switch off few peripherals, i used PMOS switch for 3V3 and added high bulk caps to avoid glitch on 3.3V controller supply line. The value resulted in upto 500uF in total distributed capacitors over 3.3V line.
I do not find any specific information that limit its the output capacitance except on page17, that says output caps may affect the output stability.
Can you please help me to avoid any major issues before i proceed further.
below is some part of the schematic
Hello Deepak,
Welcome to the MPS Forums!
The image of that schematic was really small so here is a larger version that is easier to see relative to the typical application:
Although the datasheet doesn’t talk about a maximum value for the capacitance that will be used, it is more so emphasized that a low ESR value capacitor be used. Ceramic, tantalum, and electrolytic caps should have the lowest ESRs.
Since I don’t see any MPSmart models (and DC/DC designer doesn’t provide as much customization), I would recommend experimenting with the highest effective capacitance that you have and decreasing as you see fit on an EVM. In comparison to the typical application where this module was tested and characterized at, 500uF may be slightly too much.
Although if you’d like, DC/DC designer can be used as a reference point with whatever is applicable.
Hope this provided some insight.
Best,
Krishan
