FAN5070 Datasheet | Fairchild Semiconductor

Features - Output programmable in 25m V steps from 1.05V to 1.825V using a dynamically programmable integrated 5-bit DAC - 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 - Meets Intel VRM8.5 specifications using minimum number of external ponents - 20 pin SOIC package Description 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 plete 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 Droop™ for optimal converter transient response and VRM8.5 pliance. The FAN5070 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 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 ponents. 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. Applications - Power supply for Pentium® III Platforms - VRM for Pentium III processor - Programmable power supply Block Diagram +5V VCCA 17 + 15 RD OCL + 14 RS 16 + +12V +5V 20 VCCP 1 HIDRV + + Digital Control 19 LODRV 18 GNDP 5-Bit DAC 1.24V Reference Power Good 3 GNDA 12 ENABLE/SS PWRGD 8 7 65 4 VID0 VID2 VID4 VID1 VID3 Pentium is a...