US3033

The US3033 IC combines a switching controller and a linear regulator controller all in a compact 8 pin surface mount package, providing a total solution for dual supply processor applications such as an Intel P55C ä, AMD K6ä, as well as Cyrix 6X86Lä and the M2äprocessors. Typically in these applications a dual supply regulator converts 5V to 3.3V for I/O supply and a jumper programmable supply of 1.25V to 3.5V for CORE supply .The linear regulator controller portion in the US3033 is a programmable controller allowing flexibility for the I/O regulator and has a minimum of 50mA drive current capability designed to provide ample current for an external pass transistor. The IC US3033 uses an internal regulator generated from the 12V supply to power the controller as well as the 12V supply to drive the power
MOSFET, allowing a low cost N channel MOSFET switch to be used. The IC US3033 also includes an error comparator for fast transient response, a precise voltage reference for setting the output voltage as well as a direct drive of the MOSFET for the minimum part count.