SC1186

SC1186 Programmable Synchronous DC/DC Converter, Dual LDO Controller POWER MANAGEMENT Description Features The SC1186 combines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circuitry necessary to implement three DC/DC converters for powering advanced microprocessors such as Pentium® II & III. The SC1186 switching section features an integrated 5 bit D/A converter, latched drive output for enhanced noise immunity, pulse by pulse current limiting and logic compatible shutdown. The SC1186 switching section operates at a fixed frequency of 140kHz, 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. ‹ Synchronous design, enables no heatsink solution ‹ 95% efficiency (switching section) ‹ 5 bit DAC for output programmability ‹ Designed for Intel Pentium® ll & III requirements ‹ 1.5V, 2.5V short circuit protected linear controllers ‹ 1.265V ± 1.5% Reference available Applications ‹ Pentium® ll & III microprocessor supplies ‹ Flexible motherboards ‹ 1.3V to 3.5V microprocessor supplies ‹ Programmable triple power supplies The SC1186 linear sections are low dropout regulators with short circuit protection, supplying 1.5V for GTL bus and 2.5V for non-GTL I/O. The Reference voltage is made available for exte...