Patent ID: 7859325

Claim:
A CPU core voltage supply circuit comprising: a reference voltage generator outputting a first reference voltage and a second reference voltage; a switch receiving the first reference voltage; a linear module having a differential operation amplifier and a power element, wherein the differential operation amplifier is connected to the switch and the power element, and the power element providing a CPU core voltage; a load resistor having both ends respectively connected to a first voltage and the power element; and an over-current comparator having a reference input end receiving the second reference voltage and the anther two input ends respectively connected to the both ends of the load resistor for detecting a voltage drop across the load resistor, wherein the over-current comparator compares the voltage drop with the second reference voltage, and if the voltage drop is greater than the second reference voltage, the output end of the over-current comparator outputs an over-current signal to the switch so as to control transmission of the first reference voltage to the differential operation amplifier.