ADP3197

6-Bit Programmable 2-/3-Phase Synchronous Buck Controller ADP3197 FEATURES Selectable 2-phase and 3-phase operation at up to 1 MHz per phase ±10 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers Enhanced PWM flex mode for excellent load transient performance Active current balancing between all output phases Built-in power good/crowbar blanking that supports on-the-fly VID code changes Digitally programmable 0.3750 V to 1.55 V output Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM VCC 24 RT 9 RAMPADJ 10 SHUNT REGULATOR OSCILLATOR SET GND 15 EN 16 OD UVLO SHUTDOWN 800mV EN 1 – + CURRENT BALANCING CIRCUIT + CMP – + CMP – + CMP – RESET 23 PWM1 2.2V CSREF – + RESET 2-/3-PHASE DRIVER LOGIC RESET 22 PWM2 + DAC – 250mV – 21 PWM3 CURRENT LIMIT PWRGD 2 DELAY CROWBAR 20 SW1 TTSENSE 31 19 SW2 THERMAL THROTTLING CONTROL 18 SW3 APPLICATIONS Desktop PC power supplies for Next-generation AMD processors Voltage regulator modules (VRM) VRHOT 32 14 CSCOMP ILIMIT DELAY 8 7 CURRENT MEASUREMENT AND LIMIT + – 13 CSSUM 12 CSREF GENERAL DESCRIPTION The ADP31971 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, Advanced Micro Devices, AMD processors. It uses an internal 6-bit digital-to-analog converter (DAC) to read a voltage...