A dual linear regulator circuit employing an LT1580 for the CPU core supply and an LT1587 for the I/O supply is described. This circuit can be used to power a Pentium processor or upgarde CPU.
Many manufacturers of Pentium processor-based motherboards have been searching for an economical solution to the problem of powering the present generation Pentium P54C and accommodating the upgrade processors that will soon become available. The existing processor uses a single supply for both the processor core and the I/O. For the highest frequency offerings, the supply required is 3.5V ±100mV (VRE specification). ...