ADP3186 Datasheet | Analog Devices

FEATURES Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±1% 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 5-bit digitally programmable 0.8 V to 1.55 V output Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM RAMPADJ UVLO SHUTDOWN AND BIAS EN 11 OSCILLATOR SET EN 27 PWM1 GND 19 RESET CROWBAR 6 CSREF 2.1V CMP CURRENT BALANCING CIRCUIT CMP RESET 2-/3-/4-PHASE DRIVER LOGIC RESET 26 PWM2 25 PWM3 DAC + 300m V CSREF RESET 24 PWM4 CROWBAR CURRENT LIMIT APPLICATIONS Desktop PC power supplies for AMD Opteron™ processors VRM modules - 300m V 23 SW1 PWRGD 10 DELAY 22 SW2 21 SW3 ILIMIT 15 EN 20 SW4 GENERAL DESCRIPTION The ADP3186 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 AMD processors. It 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 0.8 V and 1.55 V. It uses a multimode PWM architecture to drive the logic-level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The phase relationship of the output signals can be programmed to provide 2-, 3-, or 4-phase operation, allowing the construction of up to four plementary buck switching stages. The ADP3186 includes programmable no-load offset and slope functions to adjust the output voltage as a function of the load current, so that it is always optimally positioned for a system transient. The ADP3186 also provides accurate and reliable short-circuit protection, adjustable current limiting, and a power good output that acmodates...