DATASHEET ISL6322G FN6715 Rev 0.00 Two-Phase Buck PWM Controller with Integrated MOSFET Drivers, I2C Interface, May 22, 2008 and Phase Dropping The ISL6322G two-phase PWM control IC provides a Features precision voltage regulation system for advanced Integrated Multiphase Power Conversion microprocessors and memory. The integration of power - 2-Phase or 1-Phase Operation with Internal Drivers MOSFET drivers into the controller IC marks a departure from the separate PWM controller and driver configuration of Phase Dropping for Higher Efficiency at Low Output previous multiphase product families. By reducing the Current Loads number of external parts, this integration is optimized for a Precision Core Voltage Regulation cost and space saving power management solution. - Differential Remote Voltage Sensing One outstanding feature of this controller IC is its - 0.5% System Accuracy Over-Temperature multi-processor compatibility, allowing it to work with both Intel - Adjustable Reference-Voltage Offset and AMD microprocessors. Included are programmable VID Optimal Transient Response codes for Intel VR10, VR11, as well as AMD DAC tables. A - Active Pulse Positioning (APP) Modulation unity gain, differential amplifier is provided for remote voltage - Adaptive Phase Alignment (APA) sensing, compensating for any potential difference between Fully Differential, Continuous DCR Current Sensing remote and local grounds. The output voltage can also be - Precision Channel-Current Balancing positively or negatively offset through the use of a single external resistor. 2 I C Interface 2 - Phase Dropping The ISL6322G includes an I C interface, allowing the 2 controller to communicate with other devices over an I C - Voltage Margining Offset bus. Signals sent over this bus can command the ISL6322G - Switching Frequency Adjustment to adjust the number of active phases, voltage margining - Overvoltage Protection Level Adjustment offset, phase switching frequency, overvoltage protection - Selects Adaptive Dead Time Scheme levels, and can select the integrated driver adaptive dead 2 C Slave Only Device Address: User Selectable I time scheme. 1000 110x or 1000 111x The ISL6322G also includes advanced control loop features User Selectable Adaptive Dead Time Scheme for optimal transient response to load apply and removal. - PHASE Detect or LGATE Detect for Application One of these features is highly accurate, fully differential, Flexibility continuous DCR current sensing for channel-current balance. Active Pulse Positioning (APP) modulation is Variable Gate Drive Bias: 5V to 12V another unique feature, allowing for quicker initial response Multi-Processor Compatible to high di/dt load transients. - Intel VR10 and VR11 Modes of Operation This controller also allows the user the flexibility to choose - AMD Mode of Operation between PHASE detect or LGATE detect adaptive dead time Microprocessor Voltage Identification Inputs schemes. This ability allows the ISL6322G to be used in a -8-bit DAC multitude of applications where either scheme is required. - Selectable between Intels Extended VR10, VR11, AMD 5-bit, and AMD 6-bit DAC Tables Protection features of this controller IC include a set of - Dynamic VID Technology sophisticated overvoltage, undervoltage, and overcurrent protection. Furthermore, the ISL6322G includes protection Maximum Allowable Output Voltage of 1.6V against an open circuit on the remote sensing inputs. Overcurrent Protection Combined, these features provide advanced protection for the microprocessor and power system. Multi-Tiered Overvoltage Protection Digital Soft-Start Selectable Operation Frequency up to 1.5MHz Per Phase Pb-Free (RoHS Compliant) FN6715 Rev 0.00 Page 1 of 39 May 22, 2008ISL6322G Ordering Information PART NUMBER (Note) PART MARKING TEMP. (C) PACKAGE (Pb-Free) PKG. DWG. ISL6322GCRZ* ISL6322G CRZ 0 to +70 48 Ld 7x7 QFN L48.7x7 ISL6322GIRZ* ISL6322G IRZ -40 to +85 48 Ld 7x7 QFN L48.7x7 *Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is 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 ISL6322G (48 LD QFN) TOP VIEW 48 47 46 45 44 43 42 41 40 39 38 37 VID4 1 36 EN VID3 2 35 ISEN1+ VID2 3 34 ISEN1- VID1 4 33 PHASE1 VID0 5 32 UGATE1 VRSEL 49 BOOT1 6 31 GND SCL LGATE1 7 30 SDA PVCC 8 29 SS/RST/A0 LGATE2 9 28 VCC 10 27 BOOT2 REF 11 26 UGATE2 OFS 12 25 PHASE2 23 24 13 14 15 16 17 18 19 20 21 22 FN6715 Rev 0.00 Page 2 of 39 May 22, 2008 COMP VID5 FB VID6 IOUT VID7 VDIFF FS RGND NC VSEN NC ISEN2+ NC ISEN2- NC NC NC NC NC EN PH2 NC NC PGOOD