How to choose the W/L of output stage

[katherine]

How to make sure the W/L of output stage power MOS in synchronization buck converter!
I know there is minmum total loss when the switching loss equel to conduction loss.In the condition, we have got the optimization Width of power mos and got the highest efficiency,but how about the load current.Because the optimization Width of power mos and the highest efficiency have respect to the load current.
My question is when the converter has the highest efficiency!
Thank you!

 

[zgz1983]

I think you can make Rout=Rload.

 

[gelo]

For Optimal W at maximum efficiency, please refer to the paper presented by Stratakos A.J., Sanders, S.R., Brodersen, R.W.

"A low Voltage CMOS DC-DC Converter for a Portable Battery Operated System"
see ---IV FET Design

 

[krishnareddy]

w/l of the output stage has to be designed to minimize conduction and switching losses.