Hi Team,
According to the datasheet, following input cap vs output cap proportion is recommended but my customer want to put much amount of cap at CPU side(TPS22975's output side) as close as possible in order to minimize voltage noise due to load transient. Current their design has 88uF as TPS22975's output side and almost same amount at input as well, 1:1 proportion now.
"it is recommended to have an input capacitor about 10 times higher than the output capacitor (CL ) to avoid excessive voltage drop."
I could not understand where's excessive voltage drop will be concerned not to keep this recommended cap proportion, so could you add some more details?
I just thought more output cap should be needed to prevent voltage drop at TPS22975's load, but datasheet says input cap is important. It doesn't make sense for me.
It's nice if you can share any app note describing that.
Regards,
Takashi Onawa