View cs5161.rev6 datasheet:

CS5161/5161H CPU 5-Bit Synchronous Buck Controller Description Features The CS5161/5161H are 5-bit syn- input as the main supply for con- Dual N-Channel Design chronous dual N-Channel buck version using a discrete charge Excess of 1MHz Operation controllers designed to provide pump circuit to provide up to 20V unprecedented transient response for VCC2 and high side gate drive. 100ns Transient Response for today’s demanding high-densi- The CS5161/5161H are specifically 5-Bit DAC ty, high-speed logic. They operate designed to power Pentium® III Backward Compatible with using a proprietary control method processors and other high perfor- CS515X Family which allows a 100ns response time mance core logic. They include the to load transients. The CS5161 is 30ns Gate Ri