For a robotics project I need to use a buck regulator to power a mobile computer from a 22V LiPo battery. I am currently using this LDO regulator and am having issues with it getting very hot. Using a large heat sink, the regulator functions without shutting off due to high temperature yet since this is a mobile application I am worried about how much energy I am wasting in the form of heat. If my load is pulling 1A at 12V, is it true that the regulator is dissipating (22*1) - (12*1) = 10W? I had originally selected a linear regulator over a switching regulator because I wanted a clean, stable DC output for my computer to operate on.
I am now thinking about trying a "switching regulator" because of how most of these devices are >90% efficient! I have had a lot of trouble finding a switching regulator that could provide a 12V output (most of them seem to provide only a few volts of output, does anyone know why this is?). I found this switching regulator though which provides my needed output and is in the 90% efficient range. Does anyone have any suggestions for other switching regulators? I have to have a totally integrated package (for example, I don't have room to attach external caps or inductors for my application).
Also, is the only reason someone would choose a linear regulator over a switching regulator because they usually provide higher voltage outputs? Is using a switching regulator with a computer really not a problem?