Using the LT3695 monolithic buck switching regulator can be designed a very simple high efficiency 5 volt DC switching power supply electronic project .
LT3695 buck switching regulator operates over a wide input voltage range from 3.6V to 36V and can safely sustain transient voltages up to 60V.
A very simple 5 volts switching power supply electronic project can be designed using the LT3511 high voltage monolithic switching regulator designed by Linear Technology
The LT3511 5 volts switching power supply no third winding or opto-isolator is requiring for regulation as the part senses output voltage directly from the primary-side flyback waveform. The IC integrates a 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed.