The LX1668 is a Monolithic Switching Regulator Controller IC 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. It provides a programmable switching regulator output, together with one internal linear low dropout regulator and one adjustable linear regulator driver. The LX1668 offers a triple-output single-chip power supply for Pentium II and other processors. Programmable Synchronous Rectifier Driver for CPU Core. The main output is adjustable from 1.3 to 3.5V using a TTLcompatible 5-bit digital code to meet Intel specifications. The IC can read the signal from a DIP-switch, hardwired to Pentium II processor's pins or from software. The 5-bit code adjusts the output voltage between 1.30 and 2.05V in 50mV increments, and between 2.0 and 3.5V in 100mV increments. The device can drive dual MOSFET's resulting in typical efficiencies of 85 90%, even with loads in excess of 10A.