ADP3163

a FEATURES ADOPT™ Optimal Positioning Technology for Superior Load Transient Response and Fewest Output Capacitors Complies with VRM 9.0 and Intel VR Down Guideline with Lowest System Cost Digitally Selectable 2- or 3-Phase Operation at up to 500 kHz per Phase Quad Logic-level PWM Outputs for Interface to External High-Power Drivers Active Current Balancing between All Output Phases Accurate Multiple VRM Module Current Sharing 5-Bit Digitally Programmable 1.1 V to 1.85 V Output Total Output Accuracy ؎0.8% Over Temperature Current-Mode Operation Short Circuit Protection Enhanced Power Good Output Detects Open Outputs in Multi-VRM Power Systems Overvoltage Protection Crowbar Protects Microprocessors with No Additional External Components APPLICATIONS Desktop PC Power Supplies for: Intel Pentium® 4 Processors AMD Athlon Processors VRM Modules 5-Bit Programmable 2-/3-Phase Synchronous Buck Controller ADP3163 FUNCTIONAL BLOCK DIAGRAM VCC PC ADP3163 UVLO & BIAS SET RESET CROWBAR REF GND 3.0V REFERENCE DAC+20% 2-/3-PHASE DRIVER LOGIC PWM1 PWM2 PWM3 PGND CT OSCILLATOR POWER GOOD PWRGD SHARE CMP DAC+20% CS– CMP CS+ FB COMP SOFT START gm VID DAC VID4 VID3 VID2 VID1 VID0 GENERAL DESCRIPTION The ADP3163 is a highly efficient multiphase synchronous buck switching regulator controller optimized for converting a 5 V or 12 V main supply into the core supply voltage required by high performance Intel processors. The ADP3163 uses an internal 5-bit DAC to read a voltage identification ...