ADP3180

6-Bit Programmable 2-, 3-, 4-Phase Synchronous Buck Controller ADP3180* FEATURES Selectable 2-, 3-, or 4-Phase Operation at up to 1 MHz per Phase ؎14.5 mV Worst-Case Differential Sensing Error over Temperature Logic-Level PWM Outputs for Interface to External High Power Drivers Active Current Balancing between All Output Phases Built-In Power Good/Crowbar Blanking Supports On-the-Fly VID Code Changes 6-Bit Digitally Programmable 0.8375 V to 1.6 V Output Programmable Short Circuit Protection with Programmable Latch-Off Delay APPLICATIONS Desktop PC Power Supplies for: Next Generation Intel® Processors VRM Modules FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ 14 RT 13 ADP3180 UVLO SHUTDOWN AND BIAS 11 EN OSCILLATOR SET EN 27 PWM1 26 PWM2 25 PWM3 24 PWM4 19 GND DAC +150mV CSREF CURRENT BALANCING CIRCUIT CMP RESET CMP RESET 2-, 3-, 4-PHASE DRIVER LOGIC CMP RESET DAC –250mV CMP RESET 10 PWRGD DELAY CROWBAR CURRENT LIMIT 23 SW1 22 SW2 GENERAL DESCRIPTION The ADP3180 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 between 0.8375 V and 1.6 V, and uses a multimode PWM architecture to drive the logic level outputs at a programmable switching frequency that can be optimized for VR size and effi...