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DATASHEET
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Green Dual 4+1 PWM Controller for VR12/IMVP7
Applications with AUTO Phase Shedding
ISL6364A
The ISL6364A is a dual PWM controller; its 4-phase PWMs
control the microprocessor core or the memory voltage
regulator, while its single-phase PWM controls the peripheral
voltage regulator for graphics, system agent, or processor I/O.
The ISL6364A utilizes Intersil’s proprietary Enhanced Active
Pulse Positioning (EAPP) modulation scheme to achieve
extremely fast transient response with fewer output capacitors.
The ISL6364A 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. In addition, the ISL6364A
features auto-phase shedding to optimize the efficiency from
light to full load for Greener Environment without sacrificing
the transient performance.
Today’s microprocessors require a tightly regulated output voltage
position versus load current (droop). The ISL6364A 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 ISL6364A 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 ISL6364A with other voltage rails.
Features
• Intel VR12/IMVP7 Compliant
- SerialVID with Programmable IMAX, TMAX, BOOT,
ADDRESS OFFSET Registers
• ISL6364 Compatible
• 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
• NVM and Firmware Free for Low Cost and Easy Use
• Auto Phase Shedding Option for Greener Environment with
Boot-refresh Option
•Dual Outputs
- Output 1 (VR0): 1 to 4-Phase for Core or Memory (Coupled
Inductor and Phase Doubler, ISL6617/11A Compatible)
- Output 2 (VR1): Single Phase for Graphics, System Agent,
or Processor I/O (Phase Doubler Compatible, EN = HIGH)
- Differential Remote Voltage Sensing
- ±0.5% Closed-loop System Accuracy Over Load, Line and
Temperature
• Proprietary Active Phase Adding and Dropping with Diode
Emulation Scheme For Enhanced Light Load Efficiency
•Programmable Slew Rate of Fast Dynamic VID for VR0
• Dynamic VID Compensation (DVC) for VR1 at No Droop
• Droop and Diode Emulation Options
• Programmable 1 or 2-Phase Operation in PSI1 Mode
• Programmable Standard or Coupled-Inductor Operation
• Precision Resistor
or DCR Differential Current Sensing
- Integrated Programmable Current Sense Resistors
- Accurate Load-Line (Droop) Programming
- Accurate Current Monitoring and Channel-Current
Balancing
• Average Overcurrent Protection and Channel Current Limit
With Internal Current Comparators
• Precision Overcurrent Protection on IMON & IMONS Pins
• Independent Oscillators, up to 2MHz Per Phase, for Cost,
Efficiency, and Performance Optimization
• Dual Thermal Monitoring and Thermal Compensation
• Start-up Into Pre-Charged Load
• Pb-Free (RoHS Compliant)
April 10, 2012
FN7922.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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|Copyright Intersil Americas Inc. 2012. 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.
