Patent ID: 8194377

Claim:
An over-current protection circuit, comprising: a voltage generating unit for receiving a first voltage and generating a reference voltage, wherein the reference voltage has an offset positively dependent on temperature and negatively dependent on the first voltage, and the offset of the reference voltage varies along with another offset varying within a sense voltage sensed by the over-current protection circuit; and a comparing unit for comparing the reference voltage with the sense voltage to output a control signal for de-asserting the sense voltage when the sense voltage is correlated to an over-current condition of the sense voltage exceeding the reference voltage; wherein the voltage generating unit further comprises: a first resistor unit controlled by the first voltage to have a first resistance, the first resistance being negatively dependent on the first voltage and correlated to the offset within the reference voltage; and a second resistor unit coupled between the first resistor unit and an input of the comparing unit, the second resistor unit having a second resistance, the second resistance being positively dependent on temperature and correlated to the offset within the reference voltage.