The APD3212A/NCP3218A is a highly efficient, multi-phase, synchronous buck switching regulator controller. With its integrated drivers, the APD3212A/NCP3218A is optimized for converting the notebook battery voltage into the core supply voltage required by high performance Intel processors. An internal 7-bit DAC is used to read a VID code directly from the processor and to set the CPU core voltage to a value within the range of 0.3 V to 1.5 V. The APD3212A/ NCP3218A is programmable for 1-, 2-, or 3-phase operation. The output signals ensure interleaved 2- or 3-phase operation. The APD3212A/NCP3218A uses a multimode architecture run at a programmable switching frequency and optimized for efficiency depending on the output current requirement. The APD3212A/NCP3218A switches between single- and multi-phase operation to maximize efficiency with all load conditions. The chip includes a programmable load line slope function to adjust the output voltage as a function of the load current so that the core voltage is always optimally positioned for a load transient. The APD3212A/NCP3218A also provides accurate and reliable short-circuit protection, adjustable current limiting, and a delayed power-good output. The IC supports On-The-Fly (OTF) output voltage changes requested by the CPU. The APD3212A/NCP3218A are specified over the extended commercial temperature range of -40C to 100C. The ADP3212A is available in a 48-lead QFN 7x7mm 0.5mm pitch package. The NCP3218A is available in a 48-lead QFN 6x6mm 0.4mm pitch package. Except for the packages, the APD3212A/NCP3218A are identical. APD3212A/NCP3218A are Halogen-Free, Pb-Free and RoHS compliant.