Below is video tutorial about how to design a complex switching regulator as simple as a linear regulator – Linear Technology. Linear regulator is very simple. Linear regulator circuit has no inductor and built using a very few component and use for low power application. For higher application, we can use monolithic switch-mode regulators. This regulator has more component than linear regulator and use inductor. We can use this regulator for mid to high power application.
The best regulator called uModule regulator systems. This regulator is built in tiny package but has complete circuit. We can use this regulator from low to high power application.