6-Phase PWM Controller

® ISL6307 Data Sheet March 9, 2006 FN9224.0 6-Phase PWM Controller with 8 Bit VID Code Capable of Precision RDS(ON) or DCR Differential Current The ISL6307 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 ISL6307 features a high bandwidth control loop and ripple frequencies up to 6MHz to provide optimal response to the transients. Today’s microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6307 senses current by utilizing patented techniques to measure the voltage across the on resistance, RDS(ON), of the lower MOSFETs or DCR, of the output inductor during the lower MOSFET conduction intervals. Current sensing provides the needed signals for precision droop, channel-current balancing, and overcurrent protection. A programmable internal temperature compensation function is implemented to effectively compensate for the temperature coefficient of the current sense element. 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 ISL6307 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 • 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 RDS(ON) 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 Step - 0.5V to 1.600V operation range • Threshold-Sensitive Enable Function for Power Sequencing and VTT Enable • Thermal Monitoring • Programmable Temperature Compensation • Overcurrent Protection • Overvoltage Protection with OVP Output Indication • 2, 3, 4, 5 or 6 Phase Operation • Adjustable Switching Frequency up to 1MHz per Phase • QFN 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 ISL6307CRZ (See Note) ISL6307IRZ (See Note) TEMP. (°C) 0 to 70 -40 to 85 PACKAGE PKG. DWG. # 48 Ld 7x7 QFN L48.7x7 (Pb-free) 48 Ld 7x7 QFN L48.7x7 (Pb-free) *Add “-T” suffix to part number for tape and reel packaging. 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. Dynamic VID™ is a trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL6307 Pinout VR_HOT VR_FAN ISL6307 (48-PIN QFN) TOP VIEW EN_PWR VR_RDY EN_VTT ISEN6+ 38 ISEN6PWM6 37 36 35 34 33 32 31 GND 30 29 28 27 26 25 13 REF 14 COMP 15 FB 16 IDROOP 17 VDIFF 18 RGND 19 VSEN 20 TCOMP 21 VCC 22 ISEN523 ISEN5+ 24 PWM5 PWM3 ISEN3+ ISEN3ISEN1ISEN1+ PWM1 PWM4 ISEN4+ ISEN4ISEN2ISEN2+ PWM2 TM OVP SS 43 48 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL 1 2 3 4 5 6 7 8 9 47 46 45 44 42 FS 41 40 39 OFS 10 IOUT 11 DAC 12 2 FN9224.0 March 9, 2006 ISL6307 ISL6307 Block Diagram VDIFF VR_RDY OVP VCC RGND x1 VSEN S OVP DRIVE Q OVP THREE-STATE SOFT-START AND FAULT LOGIC CLOCK AND SAWTOOTH GENERATOR R 0.875V POWER-ON RESET (POR) 0.875V EN_VTT EN_PWR FS +200mV SS ∑ ∑ PWM PWM1 OFS OFFSET PWM PWM2 REF DAC VRSEL VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 COMP FB 2V ∑ ∑ ∑ DYNAMIC VID D/A E/A PWM PWM3 PWM PWM4 PWM PWM5 ∑ CHANNEL CURRENT BALANCE PWM PWM6 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 FN9224.0 March 9, 2006 ISL6307 Typical Application - 6-Phase Buck Converter with RDS(ON) Sensing and External TCOMP +5V VCC BOOT UGATE VIN NTC2 EXTERNAL TCOMP COMPENSATION NETWORK EN PWM GND PHASE ISL6605 DRIVER LGATE +5V +5V VCC BOOT UGATE VIN 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 DAC VCC GND EN PWM GND ISL6605 DRIVER PHASE LGATE +5V ISL6307 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ PWM5 ISEN5ISEN5+ TM EN_PWR SS VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE +5V VCC BOOT UGATE VIN µP LOAD EN PWM GND ISL6605 DRIVER PHASE LGATE VR_FAN VR_HOT +5V VCC BOOT UGATE VIN +5V TCOMP OFS FS EN R OFS RT R SS +12V ISL6605 DRIVER PHASE LGATE PWM GND NTC +5V VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE 4 FN9224.0 March 9, 2006 ISL6307 Typical Application - 6-Phase Buck Converter with RDS(ON) Sensing and Integrated TCOMP +5V VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE +5V +5V VCC BOOT UGATE VIN 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 EN PWM GND ISL6605 DRIVER PHASE LGATE +5V ISL6307 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE +5V VCC BOOT UGATE VIN µP LOAD EN PWM GND ISL6605 DRIVER PHASE LGATE VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS R SS +12V +5V VCC BOOT UGATE VIN TCOMP OFS FS +5V R OFS RT EN PWM GND ISL6605 DRIVER PHASE LGATE NTC +5V VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE 5 FN9224.0 March 9, 2006 ISL6307 Typical Application - 6-Phase Buck Converter with DCR Sensing and External TCOMP +5V VIN VCC BOOT UGATE NTC2 EXTERNAL TCOMP COMPENSATION NETWORK EN PWM GND ISL6605 DRIVER PHASE LGATE +5V +5V VCC BOOT UGATE VIN 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 EN PWM GND ISL6605 DRIVER PHASE LGATE +5V ISL6307 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE +5V VCC BOOT UGATE VIN µP LOAD EN PWM GND ISL6605 DRIVER PHASE LGATE 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 +12V NTC +5V VCC PWM GND ISL6605 DRIVER PHASE LGATE BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE 6 FN9224.0 March 9, 2006 ISL6307 Typical Application - 6-Phase Buck Converter with DCR Sensing and Integrated TCOMP +5V VIN VCC BOOT UGATE EN PWM GND ISL6605 DRIVER PHASE LGATE +5V +5V VCC BOOT UGATE VIN 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 DAC VCC GND EN PWM GND ISL6605 DRIVER PHASE LGATE +5V ISL6307 PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE +5V VCC BOOT UGATE VIN µP LOAD EN PWM GND ISL6605 DRIVER PHASE LGATE VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS +5V VCC BOOT UGATE VIN TCOMP OFS FS +5V R OFS EN RT R SS +12V PWM GND ISL6605 DRIVER PHASE LGATE NTC +5V VCC BOOT UGATE VIN EN PWM GND ISL6605 DRIVER PHASE LGATE 7 FN9224.0 March 9, 2006 ISL6307 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 6.5 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 bias mode, Note 3) . . . . . . . . . . +5V ±5% Ambient Temperature (ISL6307CRZ) . . . . . . . . . . . . . . . 0°C to 70°C Ambient Temperature (ISL6307IRZ). . . . . . . . . . . . . . -40°C to 85°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is