ADP3181

The ADP3181 is a highly efficient multiphase synchronous buck-switching regulator controller optimized for converting  a 12 V main supply into the core supply voltage required by high performance Intel processors. It uses an internal 6-bit  DAC to read a voltage identification (VID) code directly from  the processor, which is used to set the output voltage. The  CPUID input selects whether the DAC codes match the  VRM 9 or VRD 10 specifications. It uses a multimode 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-, or 4-phase operation, allowing for the construction of up to four complementary buck-switching stages. 

The ADP3181 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 ADP3181 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.  The device is specified over the commercial temperature range of 0°C to +85°C and is available in 28-lead QSOP (only VRD10 option) and TSSOP packages.