US3018

The US3018 controller IC is specifically designed to meet Intel specification for Pentium IIä microprocessor applications as well as the next generation of P6 family processors. The US3018 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.

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 18A of output current for an on- board DC/DC converter while automatically providing the right output voltage via the 5 bit internal DAC. The US3018 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 US3018 are ; Undervoltage lockout for both 5V and 12V supplies, an external programmable soft start function , programming the oscillator frequency via an external resistor, OVP circuitry for both switcher outputs and an internal thermal shutdown.