Patent ID: 8786266

Claim:
An integrated circuit device having input current and output voltage sensing for control of a voltage switching regulator, said integrated circuit device comprising: a power switching transistor having a drain coupled to a voltage source, a source coupled to an inductor of the voltage switching regulator, and a gate for controlling the power switching transistor; a driver circuit having an output coupled to the gate of the power switching transistor; a voltage level shifter circuit coupled to an input of the driver circuit; a current sense circuit for providing a sense current representative of a load current through the power switching transistor; and a switching regulator control circuit having an output coupled to the voltage level shifter circuit, a first input for receiving a voltage feedback signal representative of a voltage output of the voltage switching regulator, and a second input for receiving the sense current from the current sense circuit; the current sense circuit comprises: first and second transistors coupled in series parallel to the power switching transistor, a sensing transistor coupled with said voltage source; and a regulating circuit coupled with a node between said first and second transistor and with said sensing transistor; wherein the gate of the first transistor is coupled with the gate of the power switching transistor and the gates of the second transistor and the sensing transistor are connected, wherein the sensing transistor and the second transistor are controlled in a first mode to receive a control signal from said driver circuit and in a second mode to be biased to be switched on, wherein the first mode is a power switching transistor on mode and the second mode is a power switching transistor off mode.