US3022

The US3022 is the first controller IC with five controller in one package specifically designed to meet Intel specification for next generation microprocessor applications requiring multiple on board regulators . The US3022 provides a single chip controller IC for the Vcore , 4 LDO controllers, one with the automatic select pin that connects to the TYPE DETECT pin of the AGP slot for the AGP Vddq supply, one for GTL+ , the other for the 1.8V chip set regulator as well as 2.5V for the clock as required for the next generation PC applications. The US3022 typically uses Bipolar transistors for Vout3(1.5V) and Vout4(1.8V) and Vout5 however if Vaux pin is connected to 12V, then MOSFETs can also be used as external pass elements.

No external resistor divider of US3022  is necessary for any of the regulators. The switching regulator US3022 feature a patented topology that in combination with a few external components as shown in the typical application circuit ,will provide well in excess of 20A of output current for an on- board DC/DC converter while automatically providing the right output voltage via the 5 bit internal DAC .The US3022 also features, loss less current sensing for both switcher by using the Rds-on of the high side Power MOSFET as the sensing resistor, an output under voltage shutdown that detects short circuit condition for the linear outputs and latches the system off, and 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.