DATA SHORT
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ISL6373
EAPP Hybrid Digital
4-Phase
Green
PWM Controller for Digital Power
Management of Core and Memory with AUTO Phase Shedding
The ISL6373 is an
EAPP Hybrid Digital
4-Phase PWM
controller and is designed to be compliant to Intel
VR12.5/VR12 specifications and control the microprocessor
core or memory voltage regulator. It includes programmable
functions and telemetries for easy use, high system flexibility
and overclocking applications using SMBus, PMBus, or I
2
C
interface, which is designed to be conflict free with CPU’s SVID
bus. This hybrid digital approach eliminates the need of NVM
and Firmware often seen in a full digital solution and
significantly reduces design complexity, inventory and
manufacturing costs.
The ISL6373 utilizes Intersil’s proprietary Enhanced Active
Pulse Positioning (EAPP) modulation scheme to achieve the
extremely fast transient response with fewer output
capacitors. The ISL6373 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, PSI3), 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
ISL6373 features auto-phase shedding to optimize the
efficiency from light to full load for
Green Environment
without
sacrificing the transient performance.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The ISL6373
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 the precision voltage drop across the feedback
resistor for droop control. Current sensing circuits also provide
the needed signals for channel-current balancing, average
overcurrent protection and individual phase current limiting.
The TM pin senses an NTC thermistor’s temperature, which is
internally digitized for thermal monitoring and for integrated
thermal compensation of the current sense elements of the
regulator.
The ISL6373 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 ISL6373 with other voltage rails.
FN8350
Rev 0.00
May 13, 2013
Features
• Intel VR12.5/VR12 compliant
- SerialVID with programmable IMAX, TMAX, BOOT,
ADDRESS OFFSET registers
- VR12.5 core and VR12/VR12.5 memory
• Intersil’s proprietary
EAPP Hybrid Digital
Enhanced Active
Pulse Positioning (EAPP) Modulation Scheme (Patented)
- SMBus/PMBus/I
2
C interface with SVID conflict free
- NVM and firmware free for low cost and easy use
- Auto phase shedding option for
greener
environment
- 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 ramp adjustable options
- High frequency and PSI compensation options
- Proprietary active phase adding and dropping with diode
emulation scheme for enhanced light load efficiency
• 1 to 4-phase with phase doubler compatibility
• Differential remote voltage sensing
• ±0.5% closed-loop system accuracy over load, line and
temperature
• Programmable 1 or 2-phase operation in PSI1 mode
• Programmable slew rate of fast dynamic VID with Dynamic
VID Compensation (DVC)
• Droop and diode emulation options
• Precision resistor or DCR differential current sensing
- Integrated programmable current sense resistors
- Accurate load-line (droop) programming
- Accurate current monitoring and channel-current
balancing
• True Catastrophic Failure Protection (CFP)
• Average overcurrent protection and channel current limit with
internal current comparators
• Precision overcurrent protection on IMON pin
• Output voltage open sensing protection
• Protection disable option
• Accurate load-line (droop) programming
• Up to 2MHz per phase
• Thermal monitoring and integrated compensation
• Start-up into pre-charged load
• Pb-free (RoHS compliant)
FN8350 Rev 0.00
May 13, 2013
Page 1 of 2
ISL6373
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Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see
www.intersil.com
FN8350 Rev 0.00
May 13, 2013
Page 2 of 2
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