Hi I doubt that there is a significant demand for 10 ma output switchers. The benefit of going from 12V to 2V as a switcher compared to linear is mighty small. As a guess, I’d say that anything much under a watt is not worth doing in this arena. That gets you up to at least 100 ma at the normal conversion ranges. I would also suggest that the regulator you are replacing is only a 1A part. That places an upper limit on what makes sense.
If you really want the SMT parts, get an oven. A converted toaster oven is a dirt cheap way to do it. Bob > On Dec 4, 2016, at 4:09 PM, Attila Kinali <att...@kinali.ch> wrote: > > On Sun, 4 Dec 2016 15:45:55 -0500 > Bob Camp <kb...@n1k.org> wrote: > >> Given that the parts to build one are fairly easy to get and that we likely >> have “nutty” >> EMI requirements. Maybe a small board that drops into a 78xx footprint is >> the >> better solution. > > I don't fully agree. To go full "nutty" you would want to use the chips > in the QFN packages, as those have shorter leads and a large ground pad > to keep EMI down. But soldering an 0.5mm QFN by hand is impossible > (believe me, I tried) and not everyone has an oven. Also a lot of the > EMI performance depend on what output current you expect. Using a 1A > design for 10mA is a good way to get poor EMI performance as the > chip will go from PWM (aka fixed frequency) to PFM (aka fixed on time) > mode under low load to increase efficiency. The same goes for input > voltage. So we would need to do multiple designs for different > output current and input voltage ranges... which kind of defeats > the purpose of "a small board that drops into....". > > What could be done, though, is a small board with all components, > but the inductor on it. So then one could select the right inductor > for the application and solder it on. Using an inductor that is easy > to solder (like e.g. WE-PD3) with a wide selection of values should > do the trick. > > Attila Kinali > > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neil Stephenson > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.