The IRU3007 controller IC is specifically designed to meet Intel specification for Pentium IITM microprocessor applications as well as the next generation of P6 family processors. The IRU3007 provides a single chip controller IC for the Vcore, LDO controller for GTL+ and an internal 200mA regulator for clock supply which are required for the Pentium II applications. It also contains a switching controller to convert 5V to 3.3V regulator for on-board applications that uses either AT type power supply or is desired not to rely on the ATX power supply's 3.3V output. These devices feature a patented topology that in combination with a few external components, as shown in the typical application circuit, will provide in excess of 14A of output current for an on-board DC/DC converter while automatically providing the right output voltage via the 5-bit internal DAC. The IRU3007 also features, loss-less current sensing for both switchers by using the RDS(on) of the high-side power MOSFET as the sensing resistor, internal current limiting for the clock supply, a Power Good window comparator that switches its open collector output low when any one of the outputs is outside of a pre-programmed window. Other features of the device are: Under-Voltage Lockout for both 5V and 12V supplies, an external programmable softstart function, programming the oscillator frequency via an external resistor, Over-Voltage Protection (OVP) circuitry for both switcher outputs and an internal thermal shutdown.