SC1154

• Programmable hysteresis
• 5 bit DAC programmable output (1.3V-3.5V)
• On-chip power good and OVP functions
• Designed to meet latest Intel specifications
• Up to 95% efficiency
• + 1% tolerance over temperature

• Server Systems and Workstations
• Pentium^® II Core Supply
• Multiple Microprocessor Supplies
• Voltage Regulator Modules

The SC1154 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 SC1154 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® ll, in both single and multiple processor configurations. Inhibit, undervoltage lockout and soft-start functions are included for controlled power-up.

SC1154 features include an integrated 5 bit D/A converter, temperature compensated voltage reference, current limit comparator, over-current protection, and an adaptive deadtime circuit to prevent shoot-through of the power MOSFET during switching transitions. Power good signaling, logic compatible shutdown, and over-voltage protection are also provided. The integrated D/A converter provides programmability of output voltage from 2.0V to 3.5V in 100mV increments and 1.3V to 2.05V in 50mV increments with no external components.

The SC1154 high side driver can be configured as either a grounded reference or as a floating bootstrap driver. High and low side drivers have a peak current rating of 2 amps.