DATASHEET ISL6334D FN6802 Rev 4.00 VR11.1, 4-Phase PWM Controller with Phase Dropping, Droop Disabled and Load Apr 29, 2016 Current Monitoring Features The ISL6334D controls voltage regulator by driving up to 4 Features interleaved synchronous-rectified buck channels in parallel. This Intel VR11.1 compliant with droop disabled multiphase architecture results in multiplying channel ripple frequency and reducing input and output ripple currents. Lower Proprietary Active Pulse Positioning (APP) and Adaptive ripple results in fewer components, lower cost, reduced power Phase Alignment (APA) modulation scheme dissipation and smaller implementation area. Proprietary active phase adding and dropping for high Microprocessor loads can generate load transients with light-load efficiency extremely fast edge rates and requires high efficiency at light Precision multiphase core voltage regulation load. The ISL6334D utilizes Intersils proprietary Active Pulse - Differential remote voltage sensing Positioning (APP), Adaptive Phase Alignment (APA) - 0.5% closed-loop system accuracy over load, line and modulation scheme, active phase adding and dropping to temperature achieve and maintain the extremely fast transient response - Bi-directional, adjustable reference-voltage offset with fewer output capacitors and high efficiency from light to full load. Precision resistor or DCR differential current sensing The ISL6334D is designed to be completely compliant with - Accurate channel-current balancing Intel VR11.1 specifications. It accurately reports the load - Accurate load current monitoring via the IMON pin current via the IMON pin to the microprocessor, which sends Microprocessor voltage identification input an active low PSI signal to the controller at low power mode. The controller then enters 1- or 2-phase operation with a diode - Dynamic VID technology for VR11.1 requirement emulation option to reduce magnetic core and switching - 8-Bit VID, VR11 compatible losses, yielding high efficiency at light load. After the PSI Average overcurrent protection and channel current limit signal is de-asserted, the dropped phase(s) are added back to sustain heavy load transient response and efficiency. Precision overcurrent protection on IMON pin Thermal monitoring and overvoltage protection The ISL6334D senses the output current continuously by utilizing patented techniques to measure the voltage across the dedicated Integrated programmable temperature compensation current sense resistor or the DCR of the output inductor. Current Integrated open sense line protection sensing circuits also provide the needed signals for channel-current balancing, average overcurrent protection and 1- to 4-phase operation, coupled inductor compatibility individual phase current limiting. An NTC thermistors Adjustable switching frequency up to 1MHz per phase temperature is sensed via the TM pin and internally digitized for Package option thermal monitoring and for integrated thermal compensation of - QFN compliant to JEDEC PUB95 MO-220 QFN (Quad Flat the current sense elements. No Leads) package outline A unity gain, differential amplifier is provided for remote voltage Pb-free (RoHS compliant) 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 ISL6334D with any other voltage rail. Dynamic VID technology allows seamless on-the-fly VID changes. The offset pin allows accurate voltage offset settings that are independent of VID setting. FN6802 Rev 4.00 Page 1 of 28 Apr 29, 2016ISL6334D Table of Contents Ordering Information 3 Pin Configuration 3 ISL6334D Block Diagram . 4 Typical Application: 4-Phase VR with PSI and No Droop . 5 Typical Application - 4-Phase Couple Inductor VR with 2-Phase PSI and No Droop . 6 Absolute Maximum Ratings . 7 Thermal Information . 7 Operating Conditions 7 Electrical Specifications 7 Functional Pin Description . 10 Operation . 11 Multiphase Power Conversion . 11 Interleaving . 11 PWM Modulation Scheme 12 PWM and PSI Operation . 12 Switching Frequency . 12 Current Sensing . 13 Channel-Current Balance . 14 Voltage Regulation 14 Output-Voltage Offset Programming 17 Dynamic VID 17 Operation Initialization 18 Enable and Disable 18 Soft-Start . 18 Current Sense Output . 19 Fault Monitoring and Protection 19 VR RDY Signal 19 Undervoltage Detection 19 Overvoltage Protection . 19 Overcurrent Protection . 20 Thermal Monitoring (VR HOT/VR FAN) 20 Temperature Compensation 21 Integrated Temperature Compensation . 21 Design Procedure . 22 External Temperature Compensation . 22 General Design Guide . 22 Power Stages . 23 Current Sensing Resistor . 23 Compensation 24 Output Filter Design 24 Switching Frequency Selection 25 Input Capacitor Selection . 25 Layout Considerations 26 Component Placement . 26 Voltage-Regulator (VR) Design Materials 26 Revision History 27 About Intersil 27 Package Outline Drawing 28 FN6802 Rev 4.00 Page 2 of 28 Apr 29, 2016