Using LT3980 manufactured by Linear Technology can be designed a very simple 5 volts dc converter circuit.
The LT3980 has an adjustable frequency from 100kHz to 2.4MHz and accepts input voltages up to 58V . The transient voltage of the LT3980 is around 80 volts . The maximum output current which can be delivered by the LT3980 monolithic buck switching regulator is around 2 Amps .
Using LTM8031 integrated circuit, manufactured by linear technology, can be designed a very simple high efficiency dc dc converter circuit.
This LMT8031 dc voltage converter circuit will provide a 5 volts output from a wide input voltage range between 7 and 36V dc.
The switching frequency range of LTM8031 is from 200kHz to 2.4MHz which can be set by a single resistor.