Programmable Synchronous DC/DC Hysteretic Controller With VRM 8.5 VID Range

The SC1159 is a synchronous-buck switch-mode con- troller designed for use in single ended power supply ap- plications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hys- teresis. The SC1159 is ideal for implementing DC/DC converters needed to power advanced Microprocessors such as Pentium llI and Athlon, in both single and mul- tiple processor configurations. Inhibit, under-voltage lock- out and soft-start functions are included for controlled power-up. By Semtech Corporation