The invention provides a switching converter comprising as few as two high-side switching transistors and a low-side rectifying device, along with a control circuit. The switching converter is capable of operating from a main supply source or an auxiliary supply source. The invention further includes...http://www.google.fr/patents/US7898109?utm_source=gb-gplus-shareBrevet US7898109 - Switching power supply controller with built-in supply switching
Switching power supply controller with built-in supply switching
