DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/isl6388
ISL6388
FN8571
Rev 0.00
Apr 15, 2014
Advanced Linear EAPP Digital 6-Phase Green PWM Controller for Digital Power
Management With NVM and AUTO Phase Shedding
The ISL6388 is a smart and smallest 6-Phase Green PWM
Features
controller, designed to be compliant to Intel VR12.5/VR12
• Intel VR12.5/VR12 compliant for core and memory
specifications and control the microprocessor core or memory
voltage regulator. It includes programmable functions and
telemetries for easy use, system flexibility and over-clocking
- Programmable IMAX, TMAX, BOOT, DVID rate, address
2
• SMBus/PMBus/I C compatible
2
applications using SMBus, PMBus, or I C interface, which is
- Up to 1.5MHz bus interface with SVID conflict free
designed to be conflict free with CPU’s SVID bus and to
program NVM banks up to 8 different compensations and
system parameters. This minimizes external components and
significantly reduces design complexity and PCB area, and
simplifies the manufacturing process.
- NVM to store up to 8 configurations with programmable
frequency, droop, auto, faults (OCP, UVP, CFP), etc.
- No firmware required and hassle free with checksum
• Advanced Linear EAPP Digital control scheme (patented)
- Digitally programmable compensation
The ISL6388 utilizes Intersil’s proprietary Advanced Linear EAPP
(Enhanced Active Pulse Positioning) Digital control scheme to
achieve the extremely fast linear transient response with fewer
output capacitors and overcomes many hurdles of traditional
digital approach, which uses non-linear, discrete control method
for both voltage loop and current balance loop and runs into beat
frequency oscillation and non-linear response. The ISL6388
accurately monitors the load current via the IMON pin and
- 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
reports this information via the I
register to the
OUT
- Active phase adding and dropping with diode emulation
scheme for enhanced light load efficiency
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 ISL6388
features auto-phase shedding to optimize the efficiency from light
to full load for Greener Environment without sacrificing the
transient performance.
• Phase doubler and coupled-inductor compatibility
• Differential remote voltage sensing with ±0.5% accuracy
• Programmable 1- or 2-phase operation in PSI1 mode
• Programmable slew rate of fast dynamic VID with dynamic VID
compensation (DVC)
• Support 5V PWM or 3.3V PWM DrMOS and driver
• Zero current shutdown with ISL6627
• Precision resistor or DCR differential current sensing
- Accurate load-line (Droop) programming and control
The ISL6388 senses the output current continuously by a
dedicated current sense resistor or the DCR of the output
inductor. The sensed current flows through a digitally
programmable 1% droop resistor for precision load-line 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.
- Accurate current monitoring and channel-current balancing
with calibration capability
• True input current sensing for catastrophic failure protection
• Average overcurrent protection and channel-current limiting
• High common mode current sense input (VCC-1.5V)
• Open sensing and single point of loop failure protection
• Thermal monitoring and integrated compensation
• 1- to 6-Phase option and up to 2MHz per phase
• Start-up into pre-charged load
The ISL6388 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 ISL6388 with other voltage rails.
• Pb-Free (RoHS Compliant) 40 Ld 5x5 Plastic Package
Applications
• Core and memory for Intel VR12/VR12.5 based processor
• High performance server core or memory rail
• High performance graphic rail
• High-end desktop with over-clocking option
FN8571 Rev 0.00
Apr 15, 2014
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