FAN5029

www.DataSheet4U.com FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller December 2005 FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller Features ■ Selectable 2-, 3-, 4-, or 5-phase operation at up to ■ ■ ■ ■ ■ ■ Description The FAN5029 is a highly efficient multi-phase synchronous buck switching regulator controller optimized for converting a 12V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 8-bit DAC to read voltage identification (VID) code directly from the processor, which is used to set the output voltage between 0.5V and 1.6V. It uses a multi-mode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The phase relationship of the output signals can be programmed to provide 2-, 3-, 4-, or 5-phase operation, allowing for the construction of up to five complementary buck switching stages. The FAN5029 also includes programmable no-load offset and slope functions to adjust the output voltage as a function of the load current, so that it is always optimally positioned for a system transient. The FAN5029 also provides accurate and reliable short circuit protection, adjustable current limiting, and a delayed Power Good output that accommodates on-the-fly output voltage changes requested by the CPU. FAN5029 is specified over the extended commercial temperature range of 0°C to +85°C and is available in ...