4-Phase PWM Controller

www.DataSheet4U.com ® ISL6326B Data Sheet April 21, 2006 FN9286.0 4-Phase PWM Controller with 8-Bit DAC Code Capable of Precision DCR Differential Current Sensing The ISL6326B 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 ISL6326B 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 ISL6326B 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. The sensed current flows out of FB pin to develop the precision voltage drop across the feedback resistor for droop control. Current sensing also provides the needed signals for channel-current balancing, and overcurrent protection. A programmable integrated temperature compensation function is implemented to effectively compensate for the temperature coefficient 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 ISL6326B 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 • Thermal Monitoring • Integrated Programmable Temperature Compensation • Overcurrent Protection and Channel Current Limit • Load Current Indicator and External Overcurrent Protection Threshold Setup • 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 (Note) PART MARKING TEMP. (°C) 0 to70 PACKAGE (Pb-Free) PKG. DWG. # ISL6326BCRZ ISL6326BCRZ ISL6326BIRZ ISL6326BIRZ 40 Ld 6x6 QFN L40.6x6 -40 to 85 40 Ld 6x6 QFN L40.6x6 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 ISL6326B Pinout ISL6326B (40 LD QFN) TOP VIEW EN_PWR 32 VR_RDY VR_HOT VR_FAN EN_VTT VID7 TM 40 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL OFS DAC 1 2 3 4 5 6 7 8 9 10 11 REF 39 38 37 36 35 34 FS 33 31 30 29 28 27 ISEN3+ ISEN3ISEN2ISEN2+ PWM2 PWM4 ISEN4+ ISEN4ISEN1ISEN1+ PWM3 26 25 24 23 22 21 20 PWM1 GND 12 COMP 13 FB 14 IOUT 15 VDIFF 16 RGND SS 17 VSEN 18 TCOMP 19 VCC 2 FN9286.0 April 21, 2006 www.DataSheet4U.com ISL6326B ISL6326BCR Block Diagram VDIFF VR_RDY FS RGND VSEN X1 + CLOCK AND RAMP GENERATOR N POW ER-ON RESET (POR) + 0.875 EN_VTT 0.875 + + OVP SOFTSTART AND FAULT LOGIC EN_PW R - +175m V APP and APA MODULATOR PW M1 SS VRSEL VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 DAC Dynam ic VID D/A APP and APA MODULATOR PW M2 APP and APA MODULATOR PW M3 APP and APA MODULATOR OFFSET PW M4 OFS REF FB COMP + E/A - CHANNEL CURRENT BALANCE AND PEAK CURRENT LIMIT CHANNEL DETECT N 2.0V - O CP OCP - I_TRIP ISEN1+ ISEN1ISEN2+ + IOUT + 1 N Σ TEMPERATURE COMPENSATION CHANNEL CURRENT SENSE ISEN2ISEN3+ ISEN3ISEN4+ ISEN4- VR_HOT THERMAL MONITOR VR_FAN TEMPERATURE COMPENSATION GAIN ADJUST TM TCOMP GND 3 FN9286.0 April 21, 2006 www.DataSheet4U.com ISL6326B Typical Application - 4-Phase Buck Converter with Integrated Thermal Compensation +12V PVCC +5V VCC UGATE PHASE VIN BOOT ISL6612 DRIVER FB COMP VCC DAC REF VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL VR_FAN VR_HOT VIN PWM3 ISEN3ISEN3+ VCC UGATE PHASE +12V PVCC VIN BOOT uP LOAD PWM2 ISEN2ISEN2+ PWM EN_VTT PWM1 ISEN1ISEN1+ VCC UGATE PHASE +12V PVCC VIN BOOT PWM LGATE GND ISL6326B ISL6612 DRIVER LGATE GND ISL6612 EN_PWR GND PWM4 IOUT TCOMP TM +5V +5V OFS FS ISEN4ISEN4+ SS +12V PVCC VCC UGATE PHASE NTC VIN BOOT PWM DRIVER LGATE GND ISL6612 DRIVER PWM LGATE GND 4 FN9286.0 April 21, 2006 www.DataSheet4U.com ISL6326B Typical Application - 4-Phase Buck Converter with External Thermal Compensation NTC o C +5V +12V VCC BOOT1 VIN UGATE1 PHASE1 FB COMP VCC DAC REF LGATE1 VDIFF VSEN RGND VTT VR_RDY VID7 VID6 VID5 VID4 VID3 VID2 VID1 ISEN3+ VID0 VRSEL VR_FAN VR_HOT VIN UGATE1 EN_PWR PWM4 GND IOUT TCOMP TM +5V PWM1 UGATE2 PHASE2 NTC LGATE2 PWM2 PGND OFS FS SS ISEN4ISEN4+ GND LGATE1 PHASE1 ISEN2+ ISEN2PWM2 +12V VCC BOOT1 VIN uP LOAD PWM3 ISEN3PWM2 PWM1 EN_VTT ISEN1+ ISEN1PWM1 UGATE2 PHASE2 GND ISL6614 DRIVER PVCC BOOT2 5V To 12V VIN ISL6326B LGATE2 PGND ISL6614 DRIVER PVCC BOOT2 5V To 12V VIN 5 FN9286.0 April 21, 2006 www.DataSheet4U.com ISL6326B 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 (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 (ISL6326BCRZ) . . . . . . . . . . . . . 0°C to 70°C Ambient Temperature (ISL6326BIRZ) . . . . . . . . . . . . .-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 - 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 ISL6326BCRZ (VID = 1V-1.6V, TJ = 0°C to 70°C) System Accuracy of ISL6326BCRZ (VID = 0.5V-1V, TJ = 0°C to 70°C) System Accuracy of ISL6326BIRZ (VID = 1V-1.6V, TJ = -40°C to 85°C) System Accuracy of ISL6326BIRZ (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 4 0.5 0.9 0.6 1 -20 0.4 0.4 7 %VID %VID %VID %VID µA V V V V mA 4.3 3.7 0.850 0.720 0.850 0.720 4.5 3.9 0.875 130 0.745 0.875 130 0.745 4.7 4.2 0.910 0.775 0.910 0.775 V V V mV V V mV V 6 FN9286.0 April 21, 2006 www.DataSheet4U.com ISL6326B Electrical Specifications PARAMETER DAC Sink Current REF Source Current REF Sink Current PIN-ADJUSTABLE OFFSET Voltage at OFS Pin Offset resistor connected to ground Voltage below VCC, offset resistor connected to VCC OSCILLAT