4-Phase Buck PWM Controller

www.DataSheet4U.com ® ISL6322 Data Sheet August 21, 2006 FN6328.0 Four-Phase Buck PWM Controller with Integrated MOSFET Drivers and I2C Interface for Intel VR10, VR11, and AMD Applications The ISL6322 four-phase PWM control IC provides a precision voltage regulation system for advanced microprocessors. The integration of power MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of previous multiphase product families. By reducing the number of external parts, this integration is optimized for a cost and space saving power management solution. One outstanding feature of this controller IC is its multi-processor compatibility, allowing it to work with both Intel and AMD microprocessors. Included are programmable VID codes for Intel VR10, VR11, as well as AMD DAC tables. A unity gain, differential amplifier is provided for remote voltage sensing, compensating for any potential difference between remote and local grounds. The output voltage can also be positively or negatively offset through the use of a single external resistor. The ISL6322 includes an I2C interface, allowing the controller to communicate with other devices over an I2C bus. Signals sent over this bus can command the ISL6322 to adjust voltage margining offset, converter switching frequency, and overvoltage protection levels, and can select the integrated driver adaptive dead time scheme. The ISL6322 also includes advanced control loop features for optimal transient response to load apply and removal. One of these features is highly accurate, fully differential, continuous DCR current sensing for load line programming and channel current balance. Active Pulse Positioning (APP) modulation is another unique feature, allowing for quicker initial response to high di/dt load transients. This controller also allows the user the flexibility to choose between PHASE detect or LGATE detect adaptive dead time schemes. This ability allows the ISL6322 to be used in a multitude of applications where either scheme is required. Protection features of this controller IC include a set of sophisticated overvoltage, undervoltage, and overcurrent protection. Furthermore, the ISL6322 includes protection against an open circuit on the remote sensing inputs. Combined, these features provide advanced protection for the microprocessor and power system. Features • Integrated Multiphase Power Conversion - 2 or 3-Phase Operation with Internal Drivers - 4-Phase Operation with External PWM Driver Signal • Precision Core Voltage Regulation - Differential Remote Voltage Sensing - ±0.5% System Accuracy Over Temperature - Adjustable Reference-Voltage Offset • Optimal Transient Response - Active Pulse Positioning (APP) Modulation - Adaptive Phase Alignment (APA) • Fully Differential, Continuous DCR Current Sensing - Accurate Load Line Programming - Precision Channel Current Balancing • I2C Interface - Voltage Margining Offset - Switching Frequency Adjustment - Overvoltage Protection Level Adjustment - Selects Adaptive Dead Time Scheme • User Selectable I2C “Slave Only” Device Address: 1000_110x or 1000_111x • User Selectable Adaptive Dead Time Scheme - PHASE Detect or LGATE Detect for Application Flexibility • Variable Gate Drive Bias: 5V to 12V • Multi-Processor Compatible - Intel VR10 and VR11 Modes of Operation - AMD Mode of Operation • Microprocessor Voltage Identification Inputs - 8-Bit DAC - Selectable between Intel’s Extended VR10, VR11, AMD 5-bit, and AMD 6-bit DAC Tables - Dynamic VID Technology • Overcurrent Protection • Multi-Tiered Overvoltage Protection • Digital Soft-Start • Selectable Operation Frequency up to 1.5MHz Per Phase • Pb-Free Plus Anneal Available (RoHS Compliant) 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 ISL6322 Ordering Information PART NUMBER* (Note) PART MARKING TEMP. (°C) 0 to 70 PACKAGE (Pb-Free) 48 Ld 7x7 QFN PKG. DWG. # L48.7x7 L48.7x7 ISL6322CRZ ISL6322CRZ ISL6322IRZ ISL6322IRZ -40 to 85 48 Ld 7x7 QFN *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. Pinout ISL6322 (48 LD QFN) TOP VIEW UGATE3 LGATE3 PHASE3 38 ISEN3+ BOOT3 PVCC3 ISEN3VID5 VID6 VID7 PGOOD 37 36 EN 35 ISEN1+ 34 ISEN133 PHASE1 32 UGATE1 49 GND 31 BOOT1 30 LGATE1 29 PVCC1_2 28 LGATE2 27 BOOT2 26 UGATE2 25 PHASE2 13 COMP 14 FB 15 IDROOP 16 VDIFF 17 RGND 18 VSEN 19 ISEN2+ 20 ISEN221 ISEN4+ 22 ISEN423 EN_PH4 24 PWM4 48 VID4 VID3 VID2 VID1 VID0 VRSEL SCL SDA SS/RST/A0 1 2 3 4 5 6 7 8 9 47 46 45 FS 44 43 42 41 40 39 VCC 10 REF 11 OFS 12 2 FN6328.0 August 21, 2006 www.DataSheet4U.com ISL6322 Block Diagram PGOOD OPEN SENSE LINE DETECT VSEN x1 RGND VDIFF UNDERVOLTAGE DETECTION LOGIC SOFT-START AND FAULT LOGIC BOOT1 UGATE1 PHASE1 0.2V LGATE1 LOAD APPLY TRANSIENT ENHANCEMENT I2C LOGIC CLOCK AND MODULATOR WAVEFORM GENERATOR VRSEL MODE/DAC SELECT 0.85V POWER-ON RESET VCC PVCC1_2 EN OVERVOLTAGE DETECTION LOGIC MOSFET DRIVER SS/RST/A0 SCL SDA FS BOOT2 MOSFET DRIVER UGATE2 PHASE2 LGATE2 PWM2 PWM1 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 REF E/A FB DYNAMIC VID D/A I_TRIP OC ∑ ∑ PWM3 ∑ PWM4 PH4 POR/ DETECT CHANNEL DETECT EN_PH4 PVCC3 ∑ BOOT3 MOSFET DRIVER CHANNEL CURRENT BALANCE I_AVG 1 N UGATE3 PHASE3 LGATE3 COMP OFS OFFSET IDROOP I_AVG ∑ PWM4 SIGNAL LOGIC CH1 CURRENT SENSE CH2 CURRENT SENSE CH3 CURRENT SENSE CH4 CURRENT SENSE PWM4 ISEN1- ISEN1+ ISEN2- ISEN2+ ISEN3- ISEN3+ ISEN4- ISEN4+ GND 3 FN6328.0 August 21, 2006 www.DataSheet4U.com ISL6322 ISL6322 Integrated Driver Block Diagram PVCC DRSEL BOOT UGATE 20kΩ GATE CONTROL LOGIC SHOOTTHROUGH PROTECTION 10kΩ PHASE PWM SOFT-START AND FAULT LOGIC LGATE Simplified I2C Bus Architecture +5V +5V I2C BUS MASTER SDA SCL SCL SDA SCL SDA SCL SDA SCL SDA +5V SLAVE IC #1 SLAVE IC #2 ISL6322 A0 ISL6322 A0 RSS RSS SLAVE ADDRESS: 1000_110x SLAVE ADDRESS: 1000_111x NOTE: PIN A0 SELECTS THE SLAVE ADDRESS FOR THE ISL6322 4 FN6328.0 August 21, 2006 www.DataSheet4U.com ISL6322 Typical Application - ISL6322 (4-Phase) +12V FB COMP VSEN RGND +5V VCC PHASE1 IDROOP VDIFF BOOT1 UGATE1 LGATE1 OFS FS ISEN1ISEN1+ +12V REF PVCC1_2 BOOT2 UGATE2 SCL SDA SS / RST / A0 LGATE2 LOAD PHASE2 ISL6322 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 ISEN2ISEN2+ +12V PVCC3 BOOT3 UGATE3 PHASE3 VRSEL PGOOD LGATE3 +12V ISEN3ISEN3+ +12V EN BOOT VCC UGATE PVCC PHASE +12V EN_PH4 ISL6612 LGATE GND PWM4 PWM GND ISEN4ISEN4+ 5 FN6328.0 August 21, 2006 www.DataSheet4U.com ISL6322 Typical Application - ISL6322 with NTC Thermal Compensation (4-Phase) +12V FB IDROOP COMP VSEN RGND +5V VCC PHASE1 VDIFF BOOT1 UGATE1 NTC PLACE IN CLOSE PROXIMITY LGATE1 OFS FS REF PVCC1_2 ISEN1ISEN1+ +12V BOOT2 SCL SDA SS / RST / A0 UGATE2 PHASE2 LGATE2 ISEN2ISEN2+ +12V PVCC3 LOAD ISL6322 VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 VRSEL PGOOD BOOT3 UGATE3 PHASE3 LGATE3 ISEN3ISEN3+ +12V +12V +12V EN EN_PH4 BOOT VCC UGATE PVCC PHASE ISL6612 GND LGATE PWM4 PWM GND ISEN4ISEN4+ 6 FN6328.0 August 21, 2006 www.DataSheet4U.com ISL6322 Absolute Maximum Ratings Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V Supply Voltage, PVCC . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +15V Absolute Boot Voltage, VBOOT . . . . . . . . GND - 0.3V to GND + 36V Phase Voltage, VPHASE . . . . . . . . GND - 0.3V to 15V (PVCC = 12) GND - 8V (<400ns, 20µJ) to 24V (<200ns, VBOOT-PHASE = 12V) Upper Gate Voltage, VUGATE . . . . VPHASE - 0.3V to VBOOT + 0.3V VPHASE - 3.5V (<100ns Pulse Width, 2µJ) to VBOOT + 0.3V Lower Gate Voltage, VLGATE. . . . . . . . GND - 0.3V to PVCC + 0.3V GND - 5V (<100ns Pulse Width, 2µJ) to PVCC+ 0.3V Input, Output, or I/O Voltage . . . . . . . . . GND - 0.3V to VCC + 0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . Class I JEDEC STD Thermal Information Thermal Resistance θJA (°C/W) θJC (°C/W) QFN Package (Notes 1, 2) . . . . . . . . . . 27 2.5 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C Recommended Operating Conditions VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . +5V to 12V ±5% Ambient Temperature (ISL6322CRZ) . . . . . . . . . . . . . 0°C to +70°C Ambient Temperature (ISL6322IRZ) . . . . . . . . . . . . .-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. 3. Parameter magnitude guaranteed by design. Not 100% tested. Electrical Specifications PARAMETER BIAS SUPPLIES Input Bias Supply Current Recommended Operating