The ADP3290 is a highly efficient, multi−phase, synchronous buck switching regulator controller optimized for converting a 12 V main supply voltage into the core supply voltage of high performance Intel processors. It uses an internal 8−bit DAC to read a Voltage Identification (VID) code directly from the processor, to set the output voltage between 0.5 V and 1.6 V.
This device uses a multi−mode control architecture to drive the logic−level PWM outputs. The switching frequency can be programmed according to VR size and efficiency. The chip can provide 2−, 3− or 4−phase operation, allowing for the construction of up to four complementary buck switching stages.
The ADP3290 also includes programmable no load offset and load line slope setting function that adjusts the output voltage as a function of the load current, optimally positioning it for a system transient. The ADP3290 also provides accurate and reliable short−circuit protection, adjustable current limit, and a delayed power−good output that accommodates On−The−Fly (OTF) output voltage changes requested by the CPU.

FEATUREs
• Selectable 2−, 3−, or 4−Phase Operation at Up to 1 MHz Per Phase
• ±7 mV Worse−Case Differential Sensing Error
• Logic−Level PWM Outputs for Interface to External High Power Drivers
• Fast−Enhanced PWM FlexMode™ for Excellent Load Transient Performance
• TRDET to Improve Load Release
• Active Current Balancing Between All Output Phases
• Built−In Power−Good/Crowbar Blanking Supports Dynamic VID Code Changes
• Digitally Programmable 0.5 V to 1.6 V Output Supports VR11.1 Specification
• Programmable Overcurrent Protection with Programmable Latchoff Delay
• This is a Pb−Free Device

Typical Applications
• Desktop PC Power Supplies for:
   ♦ Next Generation Intel® Processors
   ♦ VRM Modules