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DATASHEET
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Dual 6-Phase + 1-Phase PWM Controller for VR12/IMVP7
Applications
ISL6366
The ISL6366 is a dual PWM controller; its 6-phase PWMs control
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.
The ISL6366 utilizes Intersil’s proprietary Enhanced Active Pulse
Positioning (EAPP) modulation scheme to achieve extremely fast
transient response with fewer output capacitors.
The ISL6366 is designed to be compliant to Intel VR12/IMVP7
specifications. It accurately monitors the load current via the
IMON pin and reports this information via the IOUT register to
the microprocessor, which sends a PSI# signal to the controller
at low power mode via SVID bus. The controller enters 1 or
2-phase operation in low power mode (PSI1); in the ultra low
power mode (PSI2,3), it operates in single phase with diode
emulation option. In low power modes, the magnetic core and
switching losses are significantly reduced, yielding high
efficiency at light load. After the PSI# signal is de-asserted, the
dropped phase(s) are added back to sustain heavy load
transient response and efficiency.
Today’s microprocessors require a tightly regulated output voltage
position versus load current (droop). The ISL6366 senses the
output current continuously 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 to develop a
precision voltage drop across the feedback resistor for droop
control. Current sensing also provides information for channel-
current balancing, average overcurrent protection and individual
phase current limiting. The TM and TMS pins sense an NTC
thermistor’s temperature, which is internally digitized for thermal
monitoring and for integrated thermal compensation of the
current sense elements of the respective regulator.
The ISL6366 features remote voltage sensing and completely
eliminates any potential difference between remote and local
grounds. This improves regulation and protection accuracy. The
threshold-sensitive enable input is available to accurately
coordinate the start-up of the ISL6366 with other voltage rails.
Features
• Intel VR12/IMVP7 Compliant
- SerialVID with Programmable IMAX, TMAX, BOOT,
ADDRESS OFFSET Registers
• Intersil’s Proprietary Enhanced Active Pulse Positioning
(EAPP) Modulation Scheme (Patented)
- Variable Frequency Control During Load Transients to
Reduce Beat Frequency Oscillation
- Linear Control with Evenly Distributed PWM Pulses for
Better Phase Current Balance During Load Transients
- Voltage Feed-Forward and Adjustable Ramp Options
- High Frequency and PSI Compensation Options
•Dual Outputs
- Output 1 (VR0): 1 to 6-Phase for Core or Memory (Coupled
Inductor Compatible)
- Output 2 (VR1): Single Phase for Graphics, System Agent,
or Processor I/O
- Differential Remote Voltage Sensing
- ±0.5% Closed-loop System Accuracy Over Load, Line and
Temperature
- Phase Doubler Compatibility (NOT Phase Dropping via
PWM Lines)
• Proprietary Active Phase Adding and Dropping with Diode
Emulation Scheme For Enhanced Light Load Efficiency
• Programmable Slew Rate of Fast Dynamic VID with
Dynamic VID Compensation (DVC) for VR0
• Dynamic VID Compensation (DVS) for VR1 at No Droop
• Droop and Diode Emulation Options
• Programmable 1 or 2-Phase Operation in PSI1/2/3 Mode
• Programmable Standard or Coupled-Inductor Operation
• Precision Resistor
or DCR Differential Current Sensing
- Integrated Programmable Current Sense Resistors
- Integrated Thermal Compensation
- Accurate Load-Line (Droop) Programming
- Accurate Channel-Current Balancing
- Accurate Current Monitoring
• Average Overcurrent Protection and Channel Current Limit
With Internal Current Comparators
• Precision Overcurrent Protection on IMON & IMONS Pins
• Independent Oscillators, up to 1MHz Per Phase, for Cost,
Efficiency, and Performance Optimization
• Dual Thermal Monitoring and Thermal Compensation
• Start-up Into Pre-Charged Load
Pb-Free (RoHS Compliant)
February 25, 2011
FN6964.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
