Patent ID: 8887119
Filing Date: 2014-11-11
Classification: G06F

Abstract:
1. A method to determine a trim code for an integrated circuit (IC), comprising: demultiplexing a drain of a power metal-oxide-semiconductor field-effect transistor (MOSFET) from a first pin of the IC to a second pin of the IC; demultiplexing a source of the power MOSFET from a third external pin of the IC to a fourth external pin of the IC; determining a voltage difference between the second pin and the fourth pin; testing a resistance between the drain and the source of the power MOSFET, based at least in part on the voltage difference; applying a voltage between the first pin and the third pin; Kelvin sensing between the second pin and the fourth pin to adjust the applied voltage to maintain a voltage between the second pin and the fourth pin equal to the voltage difference multiplied by a predetermined value greater than one; and determining the trim code by setting a current limit threshold for the power MOSFET, based at least in part on the adjusted voltage.