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Numéro de sérieISL6334
CategoriePower Management => PWM Controllers
DescriptionVR11.1, 4-Phase PWM Controller With Light Load Efficiency Enhancement And Load Current Monitoring Features
The ISL6334, ISL6334A control microprocessor core voltage regulation by driving up to 4 interleaved synchronous-rectified buck channels in parallel. This multiphase architecture results in multiplying channel ripple frequency and reducing input and output ripple currents. Lower ripple results in fewer components, lower cost, reduced power dissipation, and smaller implementation area.
SociétéIntersil Corporation
DatasheetTélécharger ISL6334 datasheet
 
 
  • Description courte

  • VR11.1, 4-Phase PWM Controller with Light Load Efficiency Enhancement and Load Current Monitoring Features

    The ISL6334, ISL6334A control microprocessor core voltage regulation by driving to 4 interleaved synchronous-rectified buck channels in parallel. This multiphase architecture results in multiplying channel ripple frequency and reducing input and output ripple currents. Lower ripple results in fewer components, lower cost, reduced power dissipation, and smaller implementation area. Microprocessor loads can generate load transients with extremely fast edge rates and requires high efficiency at light load. The ISL6334, ISL6334A utilizes Intersil's proprietary Active Pulse Positioning (APP), Adaptive Phase Alignment (APA) modulation scheme, active phase adding and dropping to achieve and maintain the extremely fast transient response with fewer output capacitors and high efficiency from light to full load. The ISL6334A is designed to be completely compliant with Intel VR11.1 specifications. It accurately reports the load current via IMON pin to the microprocessor, which sends an active low PSI# signal to the controller at low power mode. The controller then enters or 2-phase operation with diode emulation option to reduce magnetic core and switching losses, 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. Today's microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6334, ISL6334A senses the output current continuously by utilizing patented techniques to measure the voltage across the dedicated current sense resistor or the DCR of the output inductor. The sensed current flows out of 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. An NTC thermistor's temperature is sensed via TM pin and internally digitized for thermal monitoring and for integrated thermal compensation of the current sense elements. A unity gain, differential amplifier is provided for 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 ISL6334, ISL6334A with any other voltage rail. Dynamic-VIDTM technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. 1

    Features

    · Intel VR11.1 Compliant· Proprietary Active Pulse Positioning (APP) and Adaptive Phase Alignment (APA) Modulation Scheme· Proprietary Active Phase Adding and Dropping with Diode Emulation Scheme For High Light Load Efficiency· Precision Multiphase Core Voltage Regulation - Differential Remote Voltage Sensing - ±0.5% Closed-loop System Accuracy Over Load, Line and Temperature - Bi-directional, Adjustable Reference-Voltage Offset· Precision resistor or DCR Differential Current Sensing - Accurate Load-Line (Droop) Programming - Accurate Channel-Current Balancing - Accurate Load Current Monitoring via IMON Pin· Microprocessor Voltage Identification Input - Dynamic VIDTM Technology for VR11.1 Requirement - 8-Bit VID, VR11 Compatible· Average Overcurrent Protection and Channel Current Limit· Precision Overcurrent Protection on IMON Pin· Thermal Monitoring and Overvoltage Protection· Integrated Programmable Temperature Compensation· Integrated Open Sense Line Protection· to 4-Phase Operation, Coupled Inductor Compatibility· Adjustable Switching Frequency to 1MHz Per Phase· Package Option - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline· Pb-Free (RoHS Compliant)

    CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2008. All Rights Reserved All other trademarks mentioned are the property of their respective owners.

    PART NUMBER (Note) ISL6334CRZ* ISL6334ACRZ* PART MARKING ISL6334 IRZ 6334A IRZ ISL6334 CRZ 6334A CRZ TEMP. (°C) to +70 PACKAGE (Pb-Free) Ld 6x6 QFN Ld 6x6 QFN Ld 6x6 QFN Ld 6x6 QFN PKG. DWG. # L40.6x6

    *Add "-T" suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

    EN_PWR 32 VR_RDY VR_HOT VR_FAN EN_VTT PWM3 GND DAC 12 REF 13 COMP FB 15 VDIFF 16 RGND 17 VSEN 18 TCOMP 19 VCC ISEN2+ ISEN2-

    CONTROLLER ISL6334 ISL6334A COMMENTS When PSI# is asserted low, the remained channel transmits a special PWM protocol that can be recognized only by the dedicated VR11.1 drivers ISL6622/ISL6620 for Diode Emulation (DCM) operation. The dropped channel remains in tri-state. When PSI# is asserted low, the remained channel transmits normal CCM PWM that can be recognized by any Intersil driver such ISL6596, ISL6610, and even ISL6622/ISL6620. The dropped channel remains in tri-state.

    # OF GATE DRIVE VOLTAGE DRIVES 12V 5V Dual Quad

    COMMENTS For PSI# channel and its coupled channel in coupled inductor applications or all channels For PSI# channel and its coupled channel in coupled inductor applications or all channels. For PSI# channel and its coupled channel in coupled inductor applications or all channels For dropped phases or all channels with ISL6634A For dropped phases or all channels with ISL6634A For dropped phases or all channels with ISL6634A For dropped phases or all channels with ISL6634A

    NOTE: Note: Intersil 5V and 12V drivers are mostly pin-to-pin compatible and allow dual footprint layout to optimize MOSFET selection and efficiency. Dual = One Synchronous Channel; Quad = Two Synchronous Channels.