Patent ID: 6853174

Claim:
A current mode switching regulator including a first switch and a second switch coupled to drive a switch output node for generating a switch output voltage which switch output voltage is used to generate a regulated output voltage having a substantially constant magnitude, the switching regulator comprising: a first current sensing circuit for sensing a current through the first switch and providing a first current sense signal; a second current sensing circuit for sensing a current through the second switch and providing a second current sense signal; a control circuit for generating a first switch control signal and a second switch control signal for driving the first switch and the second switch respectively for generating the switch output voltage so as to maintain the regulated output voltage at a substantially constant magnitude, the control circuit generating the switch control signals in response to a selected one of the first and second current sense signals; and a duty cycle detection circuit coupled to determine a duty cycle of the switching regulator, the duty cycle detection circuit asserting a first select signal when the duty cycle exceeds a first threshold level and asserting a second select signal when the duty cycle is less than a second threshold level, the first threshold level being greater than the second threshold level; wherein the control circuit selects the first current sense signal when the first select signal is asserted and the control circuit selects the second current sense signal when the second select signal is asserted.