The ADP3207C is a high efficiency, multi-phase, synchronous, buck-switching regulator controller optimized for converting notebook battery voltage into the core supply voltage required by high performance Intel processors. The part uses an internal 7-bit Digital-to-Analog Converter (DAC) to read Voltage Identification (VID) code directly from the processor that sets the output voltage. The phase relationship of the output signals can be programmed to provide 1-, 2-, or 3-phase operation, allowing for the construction of up to three interleaved buck-switching stages. The ADP3207C uses a multi-mode architecture to drive the logic-level PWM outputs at a programmable switching frequency that can be optimized depending on the output current requirement. The part switches between multi-phase and single-phase operation to maximize its effectiveness under all load conditions. In addition, the ADP3207C includes a programmable slope function to adjust the output voltage as a function of the load current. As a result, it is always best positioned for a system transient. The chip also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed power-good output that accommodates On-the-Fly (OTF) output voltage changes requested by the CPU.