ISL6398 Datasheet, PDF (1/57 Pages) Intersil Corporation – Programmable soft-start rate and DVID rate

DATASHEET
Advanced Linear EAPP Digital 6-Phase Green PWM Controller for
Digital Power Management with NVM and AUTO Phase Shedding
ISL6398
The ISL6398 is a smart and smallest 6-Phase Green PWM
controller, designed for networking, datacenter, and POL
applications. It includes programmable functions and
telemetries for easy use and system flexibility using SMBus,
PMBus, or I²C interface, which is designed 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.
The ISL6398 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 ISL6398
accurately monitors the load current via the IMON pin and
reports this information via the READ_IOUT register for power
management. The ISL6398 features auto-phase shedding. In low
power operation, the magnetic core and switching losses are
significantly reduced with lower phase count operation, yielding
high efficiency at light load. When APA is triggered, the dropped
phase(s) are added back to sustain heavy load transient
response and efficiency. It optimizes the efficiency from light to
full load for Greener Environment without sacrificing the transient
performance.
The ISL6398 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.
The ISL6398 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 ISL6398 with other voltage rails.
Features
• SMBus/PMBus/I²C Compatible
- Programmable IMAX, TMAX, BOOT, and address
- Programmable soft-start rate and DVID rate
- Up to 1.5MHz
- NVM to store up to 8 Configurations with programmable
frequency, droop, auto, faults (OCP, UVP, CFP), etc.
- No firmware requirement and hassle
• Advanced Linear EAPP Digital control scheme (patented)
- Digitally programmable compensation
- 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 compensation option
- Active phase adding and dropping for enhanced light load
efficiency
• Phase doubler and coupled-inductor compatibility
• Differential remote voltage sensing with ±0.5% accuracy
• Programmable minimum phase count operation
• Programmable slew rate of dynamic VID with dynamic VID
compensation (DVC)
• Support 3-state 5V 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
- 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 precharged load
• Pb-free (RoHS Compliant)
• 40 Ld 5x5 Plastic Package
Applications
• High efficiency and high density digital power
• High performance multi-phase POL and network
• Cloud Computing, Router, Data Center and Storage
• General processor power
August 13, 2015
1
FN8575.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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