The LX1660 and LX1661 Are Monolithic Switching Regulator Controller ICs designed to provide low-cost, highperformance adjustable power supply for microprocessors and other applications requiring a fast transient response and a high degree of accuracy. They provide an adjustable synchronous Pulse Width Modulator output suitable for a power supply for Pentium or other microprocessors. Synchronous Rectifier Driver For CPU Core. The devices can drive dual MOSFETs resulting in typical efficiencies of 85 - 90%, even with loads in excess of 10A. Synchronous shutdown results in increased efficiency in light load applications.