Patent ID: 7940533

Claim:
A step-down voltage converter ( 100 ) for generating a direct-current (DC) output voltage (V OUT ) from a direct-current (DC) input voltage (V IN ), comprising: a field-effect transistor (FET) (Q 1 ) switch ( 111 ) comprising a drain terminal ( 112 ) and a source terminal ( 114 ), wherein the source terminal ( 114 ) of the switch ( 111 ) is electrically coupled with the output voltage (V OUT ); a diode ( 117 ) comprising an anode ( 118 ) and a cathode ( 120 ), wherein the cathode ( 120 ) of the diode ( 117 ) is electrically coupled with the output voltage (V OUT ); a first inductor ( 124 ) electrically coupling the drain terminal ( 112 ) of the switch ( 111 ) with the input voltage (V IN ); a second inductor ( 126 ) magnetically coupled with the first inductor ( 124 ), the second inductor ( 126 ) electrically coupling the anode ( 118 ) of the diode ( 117 ) with a voltage reference ( 128 ); and a switching controller ( 110 ) coupled with the output voltage (V OUT ) and configured to control the switch ( 111 ) by way of a gate terminal ( 216 ) of the FET (Q 1 ).