FAN5071 Datasheet | Fairchild Semiconductor

Features - Output programmable in 25m V steps from 1.05V to 1.825V using a dynamically programmable integrated 5-bit DAC - Controls adjustable linears for Vclock (2.5V), Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), and Vadj (1.2V nominal) - Remote sense - Programmable Active Droop™ up to 200m V - Drives N-Channel MOSFETs - Overcurrent protection using MOSFET sensing - Overvoltage protection including startup - 85% efficiency typical at full load - Integrated Power Good and Enable/Soft Start functions - Linears start instantly - Meets Intel VRM8.5 specifications using minimum number of external ponents - 24 pin SOIC package Description The FAN5071 is a synchronous mode DC-DC controller IC which provides a highly accurate, programmable set of output voltages for multi-voltage platforms such as the Intel Pentium III, and provides a plete solution for all Intel VRM8.5 CPU applications, and for other high-performance processors. The FAN5071 features remote voltage sensing, independently adjustable current limit, and a proprietary wide-range Programmable Active Droop™ for optimal converter transient response and VRM8.5 pliance. The FAN5071 uses a 5-bit D/A converter to dynamically program the output voltage during operation from 1.05V to 1.825V in 25m V steps. The FAN5071 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 ponents. The FAN5071 includes linear regulator controllers for Vclock (2.5V),Vnorthbridge (1.8V) or Vagp (selectable 1.5V/3.3V), and Vadjustable (1.2V nominal) each adjustable with an external divider. The FAN5071 also offers integrated functions including open-collector Power Good, Output Enable/Soft Applications - Power supply for Pentium® III Platforms - VRM for Pentium III...