The FAN5070 is a synchronous mode DC-DC controller IC which provides a highly accurate, programmable output voltage for platforms such as the Intel Pentium III, and provides a complete solution for all Intel VRM8.5 CPU applications, and for other high-performance processors. The FAN5070 features remote voltage sensing, independently adjustable current limit, and a proprietary wide-range Programmable Active DroopTM for optimal converter transient response and VRM8.5 compliance. The FAN5070 uses a 5-bit D/A converter to dynamically program the output voltage during operation from 1.05V to 1.825V in 25mV steps. The FAN5070 uses a high level of integration to deliver load currents in excess of 28A from a 5V source with minimal external circuitry. Synchronous-mode operation offers optimum efficiency over the entire specified output voltage range. An on-board precision low TC reference achieves 0.8% voltage regulation without expensive external components. The FAN5070 also offers integrated functions including opencollector Power Good, Output Enable/Soft Start and current limiting, and is available in a 20 pin SOIC package.