Patent ID: 7061210

Claim:
An apparatus that is arranged to monitor a load current that is supplied from a power source node to a load node through an external resistor, the apparatus comprising: a first resistive circuit, wherein the first resistive circuit includes a first terminal that is coupled to a first node, and a second terminal that is coupled to the power source node; a second resistive circuit, wherein the second resistive circuit includes a first terminal that is coupled to a second node, a second terminal that is coupled to a power source return node; an amplifier circuit, wherein the amplifier circuit includes a first input that is coupled to the first node, a second input that is coupled to the load node, and an output that is coupled to a feedback node; a first transistor circuit, wherein the first transistor circuit includes a first terminal that is coupled to the first node, a second terminal that is coupled to the second node, and a control terminal that is coupled to the feedback node; and a second transistor circuit, wherein the second transistor circuit includes a first terminal that is coupled to the first node, a second terminal that is coupled to the power source return node, a control terminal that is coupled to the feedback node, and a selector terminal that is coupled to a selector control node.