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Green Hybrid Digital Dual 6-Phase + 1-Phase PWM Controller for VR12.5/VR12/IMVP7 Applications

热度 205

The ISL6367H is a Hybrid Digital dual PWM controller and is designed to be compliant to Intel VR12.5/VR12/IMVP7 specifications. 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. It includes programmable functions and telemetries for easy use, high system flexibility and overclocking applications using SMBus, PMBus, or I2C interface, which is designed to be conflict free with CPU’s SVID bus. This hybrid digital approach eliminates the need for NVM and Firmware often seen in a full digital solution and significantly reduces design complexity, inventory and manufacturing costs.

The ISL6367H utilizes Intersil’s proprietary Enhanced Active Pulse Positioning (EAPP) modulation scheme to achieve the extremely fast transient response with fewer output capacitors. The ISL6367H 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 ISL6367H 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 ISL6367H 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 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 ISL6367H 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 ISL6367H with other voltage rails.

  • Intel VR12.5/VR12/IMVP7 compliant
    • SerialVID with programmable IMAX, TMAX, BOOT, ADDRESS OFFSET registers
Parameters ISL6367H ISL6261 ISL6266A ISL6369
Max # of Outputs2 1 2
Max # of Phases6 2 6+1
VIN (min) (V)4.5 4.75 4.75 4.75
VIN (max) (V)14 24 24 5.25
VOUT (min) (V)0.25 0.3 0.3 0.25
VOUT (max) (V)1.52 1.5 1.5 1.52
IOUT (max) (A)200 50 100 200 | 30
VBIAS (V)4.75 to 5.25 4.75 to 5.25 4.75 to 5.25
VIDYes Yes Yes Yes
ApplicationsVR12/IMVP7 IMVP-6 IMVP-6+ VR12/IMVP7
Qualification LevelStandard Standard Standard Standard
DroopYes Yes Yes
Integrated MOSFET Driver(s)No No No

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开关控制器和 PWM 控制器 IC