DESCRIPTION
The SC1155 is a synchronous-buck switch-mode controller designed for use in single ended power supply applications where efficiency is the primary concern. The controller is a hysteretic type, with a user selectable hysteresis. The SC1155 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® llI and Athlon®, in both single and multiple processor configurations. Inhibit, under-voltage lockout and soft-start functions are included for controlled power-up.

FEATURES
 • Programmable hysteresis
 • 5 bit DAC programmable output (1.1V-1.85V)
 • On-chip power good and OVP functions
 • Designed to meet latest Intel specifications
 • Up to 95% efficiency
 • ±1% voltage tolerance over temperature

APPLICATIONS
 • Server Systems and Workstations
 • Intel Pentium® III Core Supplies
 • AMD Athlon® Core Supplies
 • Multiple Microprocessor Supplies
 • Voltage Regulator Modules