Enhanced 6-Phase PWM Controller

www.DataSheet4U.com ® ISL6327 Data Sheet June 5, 2006 FN9276.1 Enhanced 6-Phase PWM Controller with 8-Bit VID Code and Differential Inductor DCR or Resistor Current Sensing The ISL6327 controls microprocessor core voltage regulation by driving up to 6 synchronous-rectified buck channels in parallel. Multiphase buck converter architecture uses interleaved timing to multiply channel ripple frequency and reduce input and output ripple currents. Lower ripple results in fewer components, lower component cost, reduced power dissipation, and smaller implementation area. Microprocessor loads can generate load transients with extremely fast edge rates. The ISL6327 utilizes Intersil’s proprietary Active Pulse Positioning (APP) and Adaptive Phase Alignment (APA) modulation scheme to achieve the extremely fast transient response with fewer output capacitors. Today’s microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6327 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. Current sensing provides the needed signals for precision droop, channel-current balancing, and overcurrent protection. A programmable integrated temperature compensation function is implemented to effectively compensate the temperature variation of the current sense element. The current limit function provides the overcurrent protection for the individual phase. A unity gain, differential amplifier is provided for remote voltage sensing. Any potential difference between remote and local grounds can be completely eliminated using the remote-sense amplifier. Eliminating ground differences improves regulation and protection accuracy. The thresholdsensitive enable input is available to accurately coordinate the start up of the ISL6327 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. Features • Proprietary Active Pulse Positioning and Adaptive Phase Alignment Modulation Scheme • Precision Multiphase Core Voltage Regulation - Differential Remote Voltage Sensing - ±0.5% System Accuracy Over Life, Load, Line and Temperature - Adjustable Precision Reference-Voltage Offset • Precision Resistor or DCR Current Sensing - Accurate Load-Line Programming - Accurate Channel-Current Balancing - Differential Current Sense • Microprocessor Voltage Identification Input - Dynamic VID™ Technology - 8-Bit VID Input with Selectable VR11 code and Extended VR10 Code at 6.25mV Per Bit - 0.5V to 1.600V Operation Range • Thermal Monitoring • Integrated Programmable Temperature Compensation • Overcurrent Protection and Channel Current Limit • Overvoltage Protection with OVP Output Indication • 2, 3, 4, 5 or 6 Phase Operation • Adjustable Switching Frequency up to 1MHz Per Phase • Package Option - QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline - QFN Near Chip Scale Package Footprint; Improves PCB Efficiency, Thinner in Profile • Pb-Free Plus Anneal Available (RoHS Compliant) Ordering Information PART NUMBER (Note) PART MARKING TEMP. (°C) 0 to70 PACKAGE (Pb-Free) PKG. DWG. # ISL6327CRZ ISL6327CRZ ISL6327IRZ ISL6327IRZ 48 Ld 7x7 QFN L48.7x7 -40 to 85 48 Ld 7x7 QFN L48.7x7 Add “-T” suffix for tape and reel. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are 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. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. www.DataSheet4U.com ISL6327 Pinout ISL6327 (48 LD QFN) TOP VIEW EN_PWR VR_HOT VR_RDY VR_FAN EN_VTT ISEN6+ 38 ISEN6- OVP 48 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OFS IOUT DAC 1 2 3 4 5 6 47 46 45 44 43 42 41 40 39 37 36 35 34 33 32 31 PWM3 ISEN3+ ISEN3ISEN1ISEN1+ PWM1 PWM4 ISEN4+ ISEN4ISEN2ISEN2+ PWM2 GND 7 8 9 10 11 12 13 REF 14 COMP 15 FB 16 IDROOP 17 VDIFF 18 RGND 19 VSEN 20 TCOMP 21 VCC 22 ISEN523 ISEN5+ 24 PWM5 30 29 28 27 26 25 2 PWM6 TM SS FS FN9276.1 June 5, 2006 www.DataSheet4U.com ISL6327 ISL6327 Block Diagram VDIFF VR_RDY OVP VCC RGND x1 VSEN S OVP DRIVE Q OVP THREE-STATE SOFT-START AND FAULT LOGIC CLOCK AND RAMP GENERATOR R 0.875V POWER-ON RESET (POR) EN_VTT 0.875V EN_PWR FS +175mV SS APP and APA MODULATOR PWM1 OFS OFFSET APP and APA MODULATOR PWM2 REF DAC VRSEL VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 COMP FB 2V APP and APA MODULATOR PWM3 APP and APA MODULATOR PWM4 APP and APA MODULATOR DYNAMIC VID D/A E/A PWM5 APP and APA MODULATOR PWM6 CHANNEL CURRENT BALANCE AND CURRENT LIMIT CHANNEL DETECT ISEN1+ ISEN1- I_TRIP OC2 OC1 1 N ISEN2+ ∑ TEMPERATURE COMPENSATION CHANNEL CURRENT SENSE ISEN2ISEN3+ ISEN3ISEN4+ ISEN4- IOUT I_TOT IDROOP ISEN5+ THERMAL MONITORING TEMPERATURE COMPENSATION GAIN ISEN5ISEN6+ ISEN6- GND TM VR_FAN VR_HOT TCOMP 3 FN9276.1 June 5, 2006 www.DataSheet4U.com ISL6327 Typical Application - 6-Phase Buck Converter with DCR Sensing and External TCOMP +5V VCC BOOT UGATE VIN NTC2 EXTERNAL TCOMP COMPENSATION NETWORK EN PWM GND ISL6609 DRIVER LGATE PHASE +5V +5V VCC BOOT UGATE VIN EN FB COMP REF IDROOP DAC VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OVP IOUT R IOUT EN_VTT VCC GND +5V VCC PWM GND ISL6609 DRIVER PHASE LGATE BOOT UGATE VIN ISL6327 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ EN PWM GND ISL6609 DRIVER EN PWM GND ISL6609 DRIVER PHASE LGATE +5V VCC BOOT UGATE PHASE LGATE VIN μP LOAD VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS +5V VCC BOOT UGATE VIN TCOMP OFS FS EN R OFS RT R SS VIN PWM GND ISL6609 DRIVER PHASE LGATE NTC +5V VCC BOOT UGATE EN PWM GND ISL6609 DRIVER LGATE PHASE VIN 4 FN9276.1 June 5, 2006 www.DataSheet4U.com ISL6327 Typical Application - 6-Phase Buck Converter with DCR Sensing and Integrated TCOMP +5V VIN VCC BOOT UGATE EN PWM GND ISL6609 DRIVER PHASE LGATE +5V +5V VCC BOOT UGATE VIN EN FB IDROOP VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OVP IOUT R IOUT EN_VTT COMP REF PWM DAC VCC GND +5V VCC GND ISL6609 DRIVER PHASE LGATE BOOT UGATE VIN ISL6327 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ EN PWM GND ISL6609 DRIVER EN PWM GND ISL6609 DRIVER PHASE LGATE +5V VCC BOOT UGATE PHASE LGATE VIN μP LOAD VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS +5V VCC BOOT UGATE VIN TCOMP OFS FS +5V R OFS RT EN R SS VIN PWM GND ISL6609 DRIVER PHASE LGATE NTC +5V VCC BOOT UGATE EN PWM GND ISL6609 DRIVER LGATE PHASE VIN 5 FN9276.1 June 5, 2006 www.DataSheet4U.com ISL6327 Absolute Maximum Ratings Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6V All Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to VCC + 0.3V ESD (Human Body Model). . . . . . . . . . . . . . . . . . . . . . . . . . . . .>2kV ESD (Machine Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>200V ESD (Charged Device Model) . . . . . . . . . . . . . . . . . . . . . . . . >1.5kV Thermal Information Thermal Resistance (Typical, Notes 1, 2) θJA (°C/W) θJC (°C/W) QFN Package. . . . . . . . . . . . . . . . . . . . 32 3.5 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C Operating Conditions Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% Ambient Temperature (ISL6327CRZ) . . . . . . . . . . . . . . 0°C to 70°C Ambient Temperature (ISL6327IRZ) . . . . . . . . . . . . . .-40°C to 85°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. NOTES: 1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications PARAMETER VCC SUPPLY CURRENT Nominal Supply Shutdown Supply Operating Conditions: VCC = 5V, Unless Otherwise Specified TEST CONDITIONS MIN TYP MAX UNITS VCC = 5VDC; EN_PWR = 5VDC; RT = 100kΩ, ISEN1 = ISEN2 = ISEN3 = ISEN4 = ISEN5 = ISEN6 = -70μA VCC = 5VDC; EN_PWR = 0VDC; RT = 100kΩ - 18 14 26 21 mA mA POWER-ON RESET AND ENABLE POR Threshold VCC Rising VCC Falling EN_PWR Threshold Rising Hysteresis Falling EN_VTT Threshold Rising Hysteresis Falling REFERENCE VOLTAGE AND DAC System Accuracy of ISL6327CRZ (VID = 1V-1.6V), TJ = 0°C to 70°C System Accuracy of ISL6327CRZ (VID = 0.5V-1V), TJ = 0°C to 70°C System Accuracy of ISL6327IRZ (VID = 1V-1.6V), TJ = -40°C to 85°C System Accuracy of ISL6327IRZ (VID = 0.5V-1V), TJ = -40°C to 85°C VID Pull Up VID Input Low Level VID Input High Level VRSEL Input Low Level VRSEL Input High Level DAC Source Current (Note 3) (Note 3) (Note 3) (Note 3) -0.5 -0.9 -0.6 -1 -60 0.8 0.8 -40