The IRU3004 controller IC is specifically designed to meet Intel specifications for Pentium IIITM microprocessor applications as well as the next generation P6 family processors. The IC provides a single chip controller IC for the Vcore, GTL+ and clock supplies required for the Pentium III applications. The IRU3004 features a patented topology, that in combination with a few external components as shown in the typical application circuit, will provide in excess of 20A of output current for an onboard DC-DC converter while automatically providing the right output voltage via the 5-bit internal DAC meeting the latest VRM specification. The IRU3004 also features loss-less current sensing by using the RDS(on) of the high side power MOSFET as the sensing resistor and a Power Good window comparator that switches its open collector output low when the output is outside of a 10% window. Other features of the device are: under-voltage lockout for both 5V and 12V supplies, an external programmable soft-start function as well as programming the oscillator frequency by using an external capacitor.