4-Phase PWM Controller

® ISL6306 Data Sheet March 9, 2006 FN9226.0 4-Phase PWM Controller with 8-Bit DAC Code Capable of Precision RDS(ON) or DCR Differential Current Sensing The ISL6306 controls microprocessor core voltage regulation by driving up to 4 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 ISL6306 features a high bandwidth control loop and ripple frequencies up to >4MHz to provide optimal response to the transients. Today’s microprocessors require a tightly regulated output voltage position versus load current (droop). The ISL6306 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 ISL6306 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 per Bit - 0.5V to 1.6V Operation Range • Thermal Monitoring • Integrated Programmable Temperature Compensation • Threshold-Sensitive Enable Function for Power Sequencing and VTT Enable • Overcurrent Protection • Overvoltage Protection • 2, 3 or 4 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 PART MARKING TEMP. (°C) PACKAGE PKG. DWG. # ISL6306CRZ (Note) ISL6306CRZ 0 to 70 40 Ld 6x6 QFN L40.6x6 (Pb-free) ISL6306IRZ (Note) ISL6306IRZ -40 to 85 40 Ld 6x6 QFN L40.6x6 (Pb-free) 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. Dynamic VID™ is a trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners. ISL6306 Pinout VR_HOT ISL6306 (40 LD QFN) TOP VIEW EN_PWR 32 VR_RDY VR_FAN EN_VTT 40 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OFS DAC 1 2 3 4 5 39 38 37 36 35 34 33 PWM3 31 30 29 28 27 26 ISEN3+ ISEN3ISEN2ISEN2+ PWM2 PWM4 ISEN4+ ISEN4ISEN1ISEN1+ 25 24 23 22 21 20 PWM1 VID7 TM SS 16 RGND GND 6 7 8 9 10 11 REF 12 COMP 13 FB 14 IDROOP 15 VDIFF 17 VSEN 18 TCOMP 19 VCC 2 FS FN9226.0 March 9, 2006 ISL6306 ISL6306CR Block Diagram VDIFF VR_RDY VCC RGND x1 VSEN POWER-ON RESET (POR) 0.875V EN_VTT 0.875V EN_PWR OVP THREE-STATE SOFT-START AND FAULT LOGIC CLOCK AND SAWTOOTH GENERATOR FS +175mV SS ∑ PWM PWM1 OFS OFFSET ∑ PWM PWM2 REF DAC VRSEL VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 COMP FB IDROOP OC I_TRIP 1 N I_AVG VR_HOT THERMAL MONITORING VR_FAN THERMAL COMPENSATION GAIN DYNAMIC VID D/A E/A CHANNEL CURRENT BALANCE ∑ PWM PWM3 ∑ PWM PWM4 CHANNEL DETECT ISEN1+ ISEN1- ∑ TEMPERATURE COMPENSATION CHANNEL CURRENT SENSE ISEN2+ ISEN2ISEN3+ ISEN3ISEN4+ ISEN4- TM TCOMP GND 3 FN9226.0 March 9, 2006 ISL6306 Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and External TCOMP +12V VCC VIN BOOT UGATE PVCC PWM ISL6612 DRIVER LGATE +5V GND NTC THERMISTOR PHASE FB COMP REF IDROOP DAC VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL VR_FAN VR_HOT TM +5V EN_PWR SS EN_VTT VCC +12V VCC BOOT VIN UGATE PVCC ISL6612 PWM DRIVER LGATE GND PHASE ISL6306 ISEN1+ ISEN1PWM1 PWM2 ISEN2+ ISEN2PWM3 ISEN3+ ISEN3PWM4 ISEN4+ ISEN4- +12V VIN VCC BOOT UGATE PVCC ISL6612 DRIVER LGATE GND PHASE µP LOAD GND PWM TCOMP OFS FS R OFS RT +12V +12V VCC BOOT UGATE PVCC ISL6612 DRIVER LGATE GND PHASE VIN NTC PWM 4 FN9226.0 March 9, 2006 ISL6306 Typical Application - 4-Phase Buck Converter with RDS(ON) Sensing and Integrated TCOMP +12V VCC BOOT VIN UGATE PVCC PWM ISL6612 DRIVER LGATE +5V GND PHASE FB IDROOP VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL VR_FAN VR_HOT TM +5V +5V R OFS EN_VTT COMP REF DAC VCC +12V VCC BOOT VIN UGATE PVCC ISL6612 PWM DRIVER LGATE GND PHASE ISL6306 ISEN1+ ISEN1PWM1 PWM2 ISEN2+ ISEN2PWM3 ISEN3+ ISEN3PWM4 ISEN4+ ISEN4- +12V VIN VCC BOOT UGATE PVCC ISL6612 DRIVER LGATE PHASE µP LOAD GND PWM EN_PWR FS SS +12V RF RS VCC GND TCOMP OFS VIN BOOT NTC +12V UGATE PVCC ISL6612 DRIVER PWM LGATE GND PHASE 5 FN9226.0 March 9, 2006 ISL6306 Typical Application - 4-Phase Buck Converter with DCR Sensing and External TCOMP +12V VCC VIN BOOT UGATE PVCC PWM ISL6612 DRIVER LGATE +5V GND NTC THERMISTOR PHASE FB COMP REF IDROOP DAC VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL VR_FAN VR_HOT TM +5V TCOMP OFS R OFS EN_PWR FS SS EN_VTT VCC +12V VCC BOOT VIN UGATE PVCC ISL6612 PWM DRIVER LGATE GND PHASE ISL6306 ISEN1+ ISEN1PWM1 PWM2 ISEN2+ ISEN2PWM3 ISEN3+ ISEN3PWM4 ISEN4+ ISEN4- +12V VIN VCC BOOT UGATE PVCC ISL6612 DRIVER LGATE GND PHASE µP LOAD GND PWM RT +12V +12V VCC BOOT UGATE PVCC ISL6612 DRIVER LGATE GND PHASE VIN NTC PWM 6 FN9226.0 March 9, 2006 ISL6306 Typical Application - 4-Phase Buck Converter with DCR Sensing and Integrated TCOMP +12V VCC VIN BOOT UGATE PVCC PWM ISL6612 DRIVER LGATE +5V GND PHASE FB COMP REF IDROOP DAC VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL VR_FAN VR_HOT TM +5V +5V R OFS RF RS +12V NTC EN_PWR EN_VTT VCC +12V VCC BOOT VIN UGATE PVCC PHASE ISL6612 PWM DRIVER LGATE GND ISL6306 ISEN1+ ISEN1PWM1 PWM2 ISEN2+ ISEN2PWM3 ISEN3+ ISEN3PWM4 ISEN4+ ISEN4- +12V VIN VCC BOOT UGATE PVCC ISL6612 DRIVER PHASE µP LOAD GND PWM LGATE GND TCOMP OFS FS SS +12V VCC BOOT UGATE PVCC ISL6612 DRIVER PHASE VIN PWM LGATE GND 7 FN9226.0 March 9, 2006 ISL6306 Absolute Maximum Ratings Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+6V All Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to VCC + 0.3V SD (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. . . . . . . . . . . . . . . . . . . . 34 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 ±5% Ambient Temperature (ISL6306CRZ) . . . . . . . . . . . . . . 0°C to 70°C Ambient Temperature (ISL6306IRZ) . . . . . . . . . . . . . .-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 = -70µA VCC = 5VDC; EN_PWR = 0VDC; RT = 100kΩ - 15 10 18 12 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 ISL6306CRZ (VID = 1V-1.6V, TJ = 0°