The IRU3013 controller IC is specifically designed for Intel Pentium III microprocessor applications as described in the VRM 8.5 specification. The IC provides a single chip solution for the Vcore, 1.2V AGTL+, 1.8V and a third uncommitted LDO controller that can be used either as 1.2V power good detector or to provide 1.5V AGP bus in applications that this voltage is required. The IRU3013 features a patented topology that, in combination with a few external components, (*Note: See application current in figure 3) will provide in excess of 30A of output current for an onboard Vcore synchronous converter while automatically providing the output voltage specified in VRM 8.5 specification. The IRU3013 also features, loss-less current sensing by using the RDS(ON) of the high side Power MOSFET as the sensing resistor, 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 softstart function, and the ability to program the oscillator frequency by connecting an external capacitor.