6-Phase VR11 PWM Controller

® ISL6307B Data Sheet March 9, 2006 FN9225.0 6-Phase VR11 PWM Controller with 8-Bit VID Code Capable of Precision RDS(ON) or DCR Differential Current Sensing for Applications in Which Supply Voltage is Higher than 5V The ISL6307B 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 ISL6307B 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 ISL6307B 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 ISL6307B 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 • Internal 5V Shunt Regulator • 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 ISL6307BCRZ (Note) ISL6307BIRZ (Note) TEMP. (°C) PACKAGE PKG. DWG. # 0 to 70 48 Ld 7x7 QFN (Pb-free) L48.7x7 -40 to 85 48 Ld 7x7 QFN (Pb-free) 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. 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. ISL6307B Pinout ISL6307B (48 LD QFN) TOP VIEW EN_PWR VR_RDY VR_HOT VR_FAN 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 OVP TM 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 FN9225.0 March 9, 2006 ISL6307B ISL6307B Block Diagram VDIFF VR_RDY OVP VCC 0.875V x1 VSEN S OVP DRIVE Q OVP THREE-STATE SOFT-START AND FAULT LOGIC CLOCK AND SAWTOOTH GENERATOR FS R SHUNT REGULATOR POWER-ON RESET (POR) EEN_VTT RGND 0.875V EN_PWR +200mV SS ∑ ∑ PWM PWM1 OFS OFFSET PWM PWM2 REF DAC VRSEL VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 COMP FB 2V OC2 OC1 I_TRIP 1 N DYNAMIC VID D/A E/A ∑ ∑ PWM PWM3 PWM PWM4 ∑ PWM PWM5 ∑ PWM PWM6 CHANNEL CURRENT BALANCE CHANNEL DETECT ISEN1+ ISEN1ISEN2+ ∑ TEMPERATURE COMPENSATION CHANNEL CURRENT SENSE ISEN2ISEN3+ ISEN3ISEN4+ ISEN4- IOUT I_TOT IDROOP THERMAL MONITORING ISEN5+ TEMPERATURE COMPENSATION GAIN ISEN5ISEN6+ ISEN6GND TM VR_FAN VR_HOT TCOMP 3 FN9225.0 March 9, 2006 ISL6307B Typical Application - 6-Phase Buck Converter with RDS(ON) Sensing and External TCOMP +12V VCC BOOT UGATE VIN NTC2 EXTERNAL TCOMP COMPENSATION NETWORK PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V +12V 300Ω 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 ISL6307B PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VR_FAN VR_HOT TM PWM5 ISEN5ISEN5+ EN_PWR TCOMP OFS FS SS VCC GND +12V VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN µP LOAD PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN +5V PVCC ROFS RT R SS +12V NTC +12V VCC PWM GND ISL6612 DRIVER PHASE LGATE BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE 4 FN9225.0 March 9, 2006 ISL6307B Typical Application - 6-Phase Buck Converter with RDS(ON) Sensing and Integrated TCOMP +12V VIN VCC BOOT UGATE PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V +12V 300Ω 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 ISL6307B PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS VCC GND +12V VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN µP LOAD PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN TCOMP OFS FS +5V ROFS RT PVCC R SS +12V PWM GND ISL6612 DRIVER PHASE LGATE NTC +12V VCC BOOT UGATE PVCC PWM GND ISL6612 DRIVER LGATE PHASE VIN 5 FN9225.0 March 9, 2006 ISL6307B Typical Application - 6-Phase Buck Converter with DCR Sensing and External TCOMP +12V VCC BOOT UGATE VIN NTC2 EXTERNAL TCOMP COMPENSATION NETWORK PVCC PWM GND ISL6612 DRIVER LGATE PHASE +12V +12V 300Ω 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 ISL6307B PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS VCC GND +12V VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN µP LOAD PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN TCOMP OFS FS PVCC ROFS RT R SS +12V NTC +12V VCC PWM GND ISL6612 DRIVER PHASE LGATE BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE 6 FN9225.0 March 9, 2006 ISL6307B Typical Application - 6-Phase Buck Converter with DCR Sensing and Integrated TCOMP +12V VCC BOOT UGATE VIN PVCC PWM GND ISL6612 DRIVER PHASE LGATE +12V +12V 300Ω FB IDROOP VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OVP IOUT R IOUT EN_VTT ISL6307B PWM6 ISEN6ISEN6+ PWM4 ISEN4ISEN4+ PWM2 ISEN2ISEN2+ PWM1 ISEN1ISEN1+ PWM3 ISEN3ISEN3+ VR_FAN VR_HOT TM +5V PWM5 ISEN5ISEN5+ EN_PWR SS COMP REF DAC VCC GND +5V PVCC VCC BOOT UGATE ISL6612 DRIVER LGATE PHASE VIN PWM GND VCC BOOT UGATE VIN EN PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN µP LOAD EN PWM GND ISL6612 DRIVER PHASE LGATE +12V VCC BOOT UGATE VIN TCOMPOFS FS +5V ROFS PVCC RT R SS +12V PWM GND ISL6612 DRIVER PHASE LGATE NTC +12V VCC BOOT UGATE PVCC PWM GND ISL6612 DRIVER LGATE PHASE VIN 7 FN9225.0 March 9, 2006 ISL6307B Absolute Maximum Ratings Voltage at VCC when it is connected to enxternal >5V input through a resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6V IAll 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 (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 Voltage at VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% Ambient Temperature (ISL6307BCRZ) . .