RENESAS ISL6366IRZ-T

ISL6366 is a dual PWM controller; its 6-phase PWM controls the microprocessor core or memory voltage regulator, while its single-phase PWM controls the peripheral voltage regulator for graphics, system agent, or processor I/O. It uses Intersil's proprietary Enhanced Active Pulse Positioning (EAPP) modulation scheme to reduce the number of output capacitors required for transient response. The ISL6366 is designed to comply with Intel VR12/IMVP7 specifications. Load current is accurately monitored via the IMON pin and reported to the microprocessor through the IOUT register; the microprocessor sends a PSI# signal to the controller over the SVID bus during low-power mode. The controller enters 1- or 2-phase operation in low-power mode (PSI1); in ultra-low-power mode (PSI2, 3), it operates in single-phase with a diode emulation option. In low-power mode, core and switching losses are significantly reduced, providing high efficiency at light loads. When the PSI# signal is de-asserted, the dropped phases are re-added to maintain heavy-load transient response and efficiency. Today's microprocessors require strict regulation of output voltage positioning relative to load current (droop). The ISL6366 continuously senses output current by measuring the voltage across a dedicated current sense resistor or the DCR of the output inductor. The sensed current flows out of the FB pin, generating a precise voltage drop across the feedback resistor to control droop. Current sensing also provides information for channel current balancing, average overcurrent protection, and individual phase current limiting. The TM and TMS pins sense the temperature of an NTC thermistor, which is internally digitized for thermal monitoring and integrated thermal compensation of the current sense elements in the respective regulators. The ISL6366 features remote voltage sensing, completely eliminating any potential difference between the remote ground and local ground. This improves regulation and protection accuracy. A threshold-sensitive enable input can be used to accurately coordinate the ISL6366 startup with other voltage rails.

• Serial VID compliant with Intel VR12/IMVP7, with programmable IMAX, TMAX, BOOT, and address offset registers
• Intersil proprietary Enhanced Active Pulse Positioning (EAPP) modulation scheme (patented)
• Variable frequency control during load transients to reduce beat frequency oscillation
• Linear control for uniform PWM pulse distribution during load transients for improved phase current balance
• Voltage feed-forward and adjustable ramp options
• High-frequency and PSI compensation options
• Dual output
  • Output 1 (VR0): 1 to 6 phases, for core or memory (coupled inductor compatible)
  • Output 2 (VR1): single phase, for graphics, system agent, or processor I/O
• ±0.5% closed-loop system accuracy with differential remote voltage sensing across load, line, and temperature
• Phase multiplier compatibility (not phase shedding via PWM line)
• Proprietary active phase add and drop with diode emulation scheme for improved light-load efficiency
• Programmable slew rate for fast dynamic VID with Dynamic VID Compensation (DVC) for VR0
• Dynamic VID Compensation (DVS) for VR1 without droop
• Droop and diode emulation options
• Programmable 1-phase or 2-phase operation in PSI1/2/3 modes
• Programmable standard or coupled inductor operation
• Precision resistor or DCR differential current sensing
• Integrated programmable current sense resistor
• Integrated thermal compensation
• Accurate load line (droop) programming
• Accurate channel current balancing
• Accurate current monitoring
• Average overcurrent protection and per-channel current limiting with internal current comparator
• Precision overcurrent protection on IMON and IMONS pins
• Independent oscillator up to 1MHz per phase for cost, efficiency, and performance optimization
• Dual thermal monitoring and thermal compensation
• Start-up into pre-charged load
• Lead-free (RoHS compliant)

• VR12/IMVP7
• Microprocessor core or memory voltage regulator
• Peripheral voltage regulator (for graphics, system agent, or processor I/O)