Patent ID: 7852148

Claim:
A method of forming a current sense circuit comprising: providing a semiconductor substrate; forming a main transistor on the semiconductor substrate with the main transistor having a source that is formed with a source area; forming a sense transistor on the semiconductor substrate with the sense transistor having a source that is formed with a source area, with a gate of the sense transistor coupled to a gate of the main transistor, and a drain of the sense transistor coupled to a drain of the main transistor wherein the source area of the sense transistor is less than the source area of the main transistor; forming a resistor divider on the semiconductor substrate, the resistor divider having a first resistor and a second resistor with a first terminal of the first resistor coupled to an input of the resistor divider, a second terminal of the first resistor coupled to a sense node, a first terminal of the second resistor coupled to the sense node, and the input of the resistor divider coupled to the source of the main transistor; coupling the input of the resistor divider and the source of the main transistor to a first connection pad on the semiconductor substrate; coupling the source of the sense transistor to a second connection pad on the semiconductor substrate; coupling the sense node to a third connection pad on the semiconductor substrate; coupling a second terminal of the second resistor to a fourth connection pad on the semiconductor substrate; and coupling the first connection pad to a first terminal of a semiconductor package, coupling the second connection pad to a second terminal of the semiconductor package, coupling the third connection pad to a third terminal of the semiconductor package, and coupling the fourth connection pad to a fourth terminal of the semiconductor package.