5-Bit, Programmable, Single-Phase, Synchronous Buck Controller

   The ADP3209D is a highly efficient, single−phase, synchronous buck switching regulator controller. With its integrated drivers, the ADP3209D is optimized for converting the notebook battery voltage to render the supply voltage required by high performance Intel chipsets. An internal 5−bit DAC is used to read a VID code directly from the chipset and to set the GMCH core voltage to a value within the range of 0.4 V to 1.25 V.

FEATUREs
• Single−Chip Solution
• Fully Compatible with the Intel® GMCH Chipset Voltage Regulator
   Specifications
• Integrated MOSFET Drivers
• Input Voltage Range of 3.3 V to 22 V
• ±8 mV Worst−Case Differentially Sensed Core Voltage Error
   Overtemperature
• Automatic Power−Saving Modes Maximize Efficiency During Light
   Load Operation
• Soft Transient Control Reduces Inrush Current and Audio Noise
• Independent Current Limit and Load Line Setting Inputs for
   Additional Design Flexibility
• Built−In Power−Good Masking Supports Voltage Identification
   (VID) OTF Transients
• 5−Bit, Digitally Programmable DAC with 0.4 V to 1.25 V Output
• Short−Circuit Protection with Latchoff Delay
• Output Current Monitor
• 32−Lead LFCSP
• This is a Pb−Free Device

APPLICATIONs
• Notebook Power Supplies for Next−Generation Intel Chipsets