Patent ID: 7755337

Claim:
A current sensing circuit for sensing an output current generated by a voltage regulator, the current sensing circuit comprising: a first double-diffused metal-oxide semiconductor transistor, having a first gate terminal to receive an output control signal from a control circuit of the voltage regulator, configured to output a current proportional to the output current according to the output control signal; a current-voltage converter, connected to the first double-diffused metal-oxide semiconductor transistor, configured to convert the proportional current to a corresponding voltage; and a sub-circuit connected between a first drain terminal of the first double-diffused metal-oxide semiconductor transistor and the current-voltage converter, the sub-circuit including: a control element configured to output a current control signal; and a second double-diffused metal-oxide semiconductor transistor, connected between the first drain terminal of the first double-diffused metal oxide semiconductor transistor and the current-voltage converter and having a second gate terminal to receive the current control signal, configured to control current flow therethrough according to the current control signal.