I am using LDO (LM1085) in my design for conversion of 24V supply to 12V and it perfectly suits for the output current requirement.
I know that in order to ensure that the LDO works properly, I need to choose proper decoupling capacitors for that and the datasheet shows that it should be 10uF at the input and 10uF at the output of LDO.
My question is that if I use bypass capacitors (0.1uF and 100uF) for my input Supply Voltage then the effective capacitance at the input of the LDO will change, will the LDO work fine, if not, how to select the bypass capacitors for the supply and, is there any range of decoupling capacitors for the LDO? Also do the size of capacitors matter (like 0805, 0603, 1206 etc)?
In addition to that I want to ask that if I have to convert the 12V further to 5V then again the effective capacitance at the output of LDO will no longer be 10uF because of the addition of another capacitance used at the input of the 2nd LDO, how to select the capacitance values now?
I will appreciate the efforts for clearing my doubts.