ADP3188

6-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller ADP3188 FEATURES Selectable 2-, 3- or 4-phase operation at up to 1 MHz per phase ±9.5 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 FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ 14 RT 13 ADP3188 EN 11 UVLO SHUTDOWN AND BIAS OSCILLATOR SET RESET EN 27 PWM1 GND 19 CMP DAC+150mV CSREF CURRENT BALANCING CIRCUIT CMP CMP RESET 2-/3-/4-PHASE DRIVER LOGIC RESET 26 PWM2 25 PWM3 DAC-250mV CMP PWRGD 10 DELAY RESET 24 PWM4 CURRENT LIMIT 23 SW1 ILIMIT 15 EN 22 SW2 21 SW3 20 SW4 CURRENT LIMIT CIRCUIT SOFT START 17 CSSUM 16 CSREF 18 CSCOMP CROWBAR APPLICATIONS Desktop PC power supplies for Next-generation Intel® processors VRM modules DELAY 12 GENERAL DESCRIPTION The ADP3188 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. The part 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. It uses a multimode PWM architecture to drive the l...