SC1172

• Synchronous design, enables no heatsink solution
• 95% efficiency (switching section)
• 5 bit DAC for output programmability
• On chip power good function
• Designed for Intel Pentium^® II VRM8.1 requirements
• 1.5V or Adj. @ 1% for linear section

The SC1172/3 combines a synchronous voltage mode controller with a low-dropout linear regulator providing most of the circuitry necessary to implement two DC/DC converters for powering advanced microprocessors such as Pentium^® II (Klamath) or Deschutes.

The SC1172/3 switching section features an integrated 5 bit D/A converter, pulse by pulse current limiting, integrated power good signaling, and logic compatible shutdown. The SC1172/3 switching section operates at a fixed frequency of 200kHz, providing an optimum compromise between size, efficiency and cost in the intended application areas. The integrated D/A converter provides programmability of output voltage from 2.0V to 3.5V in 100mV increments and 1.30V to 2.05V in 50mV increments with no external components.

The SC1172/3 linear section is a high performance positive voltage regulator design for either the GTL bus supply at 1.5V (SC1172) or an adjustable output (SC1173).

The output of the linear regulator can provide up to 5A or more with the appropriate external MOSFET.