ADP3192A

8-Bit Programmable 2- to 4-Phase Synchronous Buck Controller ADP3192A FEATURES Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±7.7 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers Fast enhanced PWM (FEPWM) flex mode for excellent load transient performance Active current balancing between all output phases Built-in power-good/crowbar blanking supports on-the-fly VID code changes Digitally programmable 0.5 V to 1.6 V output supports both VR10.x and VR11 specifications Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM VCC 31 RT RAMPADJ 12 13 SHUNT REGULATOR UVLO SHUTDOWN GND 18 850mV EN 1 OSCILLATOR + – 19 OD CMP – + DAC + 150mV CSREF DAC – 350mV + – – + SET EN RESET RESET 30 PWM1 29 PWM2 CURRENT BALANCING CIRCUIT CMP – + CMP – + CMP – + 28 PWM3 RESET 2/3/4-PHASE DRIVER LOGIC 27 PWM4 RESET PWRGD 2 DELAY CROWBAR CURRENT LIMIT 25 SW1 TTSENSE 10 VRHOT 9 VRFAN 8 THERMAL THROTTLING CONTROL 24 SW2 23 SW3 22 SW4 17 CSCOMP APPLICATIONS Desktop PC power supplies for next generation Intel® processors VRM modules ILIMIT 11 DELAY 7 CURRENT MEASUREMENT AND LIMIT + – 15 CSREF 16 CSSUM 21 IMON IREF 20 COMP 5 4 FB PRECISION REFERENCE FBRTN 3 VIDSEL 40 32 33 34 VID DAC 35 36 37 38 39 06786-001 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Figure 1. GENERAL DESCRIPTION The ADP3192A1 is a highly efficient, multiphase, synchro...