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As technology constantly evolves and silicon geometry shrinks, different supply requirements for powering these processorsemerge. Typically the core is powered with a lower voltage thanthe I/Os. The I/Os are generally at a higher voltage to maintaina compaTIble interface with other system devices. Also, as clockspeeds of 600 MHz are reached, these processors become more power hungry. Thus, an efficient power management schemebecomes criTIcal.This applicaTIon note, in conjuncTIon with the technical note EE-170, (available from Analog Devices, Inc.), provides a guidethat can be used as a reference design for powering thoseprocessors. EE-170 provides the detailed equations andderivations for the power needs of the processors. Thisapplication note discusses the voltage regulators/switchers that are suitable for those processors running at 600 MHz. The TigerSHARC® processor requires three different supply voltages, the core voltage of 1.2 V, the internal DRAM voltage at 1.6 V, and the I/O voltage of 2.5 V. These three voltages arediscussed in details in the following sections.
