The LX1662/62A and LX1663/63A are Monolithic Switching Regulator Controller IC's designed to provide a low cost, high performance adjustable power supply for advanced microprocessors and other applications requiring a very fast transient response and a high degree of accuracy. Short-Circuit Current Limiting without Expensive Current Sense Resistors. Current-sensing mechanism can use PCB trace resistance or the parasitic resistance of the main inductor. The LX1662A and LX1663A have reduced current sense comparator threshold for optimum performance using a PCB trace. For applications requiring a high degree of accuracy, a conventional sense resistor can be used to sense current.