ADP3170

The ADP3170 is a highly efficient output synchronous buck switching regulator controller optimized for converting a 5 V main supply into the core supply voltage required by next generation Intel Celeron processors. The product uses an internal 5-bit DAC to read a voltage identification (VID) code directly from the processor, which is used to set the output voltage between 1.05 V and 1.825 V. The ADP3170 uses a current mode, constant off-time architecture to drive two N-channel MOSFETs at a programmable switching frequency that can be optimized for regulator size and efficiency.

The ADP3170 also uses a unique supplemental regulation technique called Analog Devices Optimal Positioning Technology (ADOPT) to enhance load transient performance. Active voltage positioning results in a dc/dc converter that meets the stringent output voltage specifications for high performance processors, with the minimum number of output capacitors and smallest footprint. Unlike voltage-mode and standard current-mode architectures, active voltage positioning adjusts the output voltage as a function of the load current so that it is always optimally positioned for a system transient. The ADP3170 also provides accurate and reliable short circuit protection and adjustable current limiting. It also includes an integrated overvoltage crowbar function to protect the microprocessor from destruction in case the core supply exceeds the nominal programmed voltage by more than 20%. The ADP3170 contains a 1.8 V linear regulator controller that is designed to drive an external N-channel MOSFET. This linear regulator can be used to generate auxiliary voltages (such as 1.8 V standby power) required in most motherboard designs, and has been designed to provide a high bandwidth load-transient response. The product is specified over the commercial temperature range of 0°C to 70°C and is available in a 20-lead TSSOP package.