Patent ID: 7710701

Claim:
An over-current protection circuit for providing a substantially constant current limit trip value over variations of at least one variable operating condition, the over-current protection circuit comprising: a power transistor; a sense transistor; at least one current sense transistor connected to the sense transistor; at least one current reference transistor connected to the at least one current sense transistor; a resistor connected to the at least one current reference transistor; and an additional transistor connected to the resistor, the at least one current sense transistor, and the at least one current reference transistor; wherein a gate of the at least one current sense transistor is connected to a gate of the at least one current reference transistor; wherein the additional transistor is configured to receive a first supply voltage and has a gate configured to receive a second supply voltage; and wherein the power transistor, the at least one current sense transistor, the at least one current reference transistor, and the resistor are configured to receive the second supply voltage.