Patent ID: 7768808

Claim:
An integrated synchronous rectifier package comprising: a controlled switching device having two main current carrying terminals and a control terminal; the controlled switching device comprising a MOSFET having a conduction channel and a parasitic body diode; a control circuit for sensing the direction of current through the controlled switching device main current carrying terminals and for generating a control signal provided to the control terminal to turn on the controlled switching device approximately when current begins to flow in a first direction through the controlled switching device and to turn off the controlled switching device approximately when current begins to flow in a second opposite direction through the controlled switching device; and the control circuit and controlled switching device being contained within a single package having no more than four external electrical connections, further wherein the control circuit for sensing the direction of current through the controlled switching device main current carrying terminals comprises a sensing circuit coupled across the controlled switching device for comparing a voltage across the controlled switching device to first and second thresholds, the sensing circuit causing the control signal to be generated to turn off the controlled switching device at the first threshold and to turn on the controlled switching device at the second threshold.