DATASHEET ISL6312 FN9289 Rev 6.00 Four-Phase Buck PWM Controller with Integrated MOSFET Drivers for Intel VR10, February 1, 2011 VR11, and AMD Applications The ISL6312 four-phase PWM control IC provides a Features precision voltage regulation system for advanced Integrated Multiphase Power Conversion microprocessors. The integration of power MOSFET drivers - 2- or 3-Phase Operation with Internal Drivers into the controller IC marks a departure from the separate - 4-Phase Operation with External PWM Driver Signal PWM controller and driver configuration of previous Precision Core Voltage Regulation multiphase product families. By reducing the number of - Differential Remote Voltage Sensing external parts, this integration is optimized for a cost and - 0.5% System Accuracy Over-Temperature space saving power management solution. - Adjustable Reference-Voltage Offset One outstanding feature of this controller IC is its Optimal Transient Response multi-processor compatibility, allowing it to work with both Intel - Active Pulse Positioning (APP) Modulation and AMD microprocessors. Included are programmable VID - Adaptive Phase Alignment (APA) codes for Intel VR10, VR11, as well as AMD DAC tables. A Fully Differential, Continuous DCR Current Sensing unity gain, differential amplifier is provided for remote voltage - Accurate Load Line Programming sensing, compensating for any potential difference between - Precision Channel Current Balancing remote and local grounds. The output voltage can also be User Selectable Adaptive Dead Time Scheme positively or negatively offset through the use of a single - PHASE Detect or LGATE Detect for Application Flexibility external resistor. Variable Gate Drive Bias: 5V to 12V The ISL6312 also includes advanced control loop features Multi-Processor Compatible for optimal transient response to load apply and removal. - Intel VR10 and VR11 Modes of Operation One of these features is highly accurate, fully differential, - AMD Mode of Operation continuous DCR current sensing for load line programming Microprocessor Voltage Identification Inputs and channel current balance. Active Pulse Positioning (APP) -8-bit DAC modulation is another unique feature, allowing for quicker - Selectable between Intels Extended VR10, VR11, AMD initial response to high di/dt load transients. 5-bit, and AMD 6-bit DAC Tables - Dynamic VID Technology This controller also allows the user the flexibility to choose Overcurrent Protection between PHASE detect or LGATE detect adaptive dead time Multi-Tiered Overvoltage Protection schemes. This ability allows the ISL6312 to be used in a Digital Soft-Start multitude of applications where either scheme is required. Selectable Operation Frequency up to 1.5MHz Per Phase Protection features of this controller IC include a set of Pb-Free (RoHS Compliant) sophisticated overvoltage, undervoltage, and overcurrent protection. Furthermore, the ISL6312 includes protection Ordering Information against an open circuit on the remote sensing inputs. PART NUMBER PART TEMP. PACKAGE PKG. Combined, these features provide advanced protection for the (Note 1) MARKING (C) (Pb-Free) DWG. microprocessor and power system. ISL6312CRZ ISL6312 CRZ 0 to +70 48 Ld 7x7 QFN L48.7x7 ISL6312CRZ-T ISL6312 CRZ 0 to +70 48 Ld 7x7 QFN L48.7x7 (Note 2) ISL6312CRZ-TK ISL6312 CRZ 0 to +70 48 Ld 7x7 QFN L48.7x7 (Note 2) ISL6312IRZ ISL6312 IRZ -40 to +85 48 Ld 7x7 QFN L48.7x7 ISL6312IRZ-T ISL6312 IRZ -40 to +85 48 Ld 7x7 QFN L48.7x7 (Note 2) NOTES: 1. 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. 2. Please refer to TB347 for details on reel specifications. FN9289 Rev 6.00 Page 1 of 35 February 1, 2011ISL6312 Pinout ISL6312 (48 LD QFN) TOP VIEW 48 47 46 45 44 43 42 41 40 39 38 37 VID4 1 EN 36 VID3 ISEN1+ 2 35 VID2 ISEN1- 3 34 VID1 4 33 PHASE1 VID0 5 32 UGATE1 VRSEL 49 BOOT1 6 31 GND DRSEL LGATE1 7 30 OVPSEL PVCC1 2 8 29 SS LGATE2 9 28 VCC BOOT2 10 27 REF 11 26 UGATE2 OFS 12 25 PHASE2 13 14 15 16 17 18 19 20 21 22 23 24 ISL6312 Integrated Driver Block Diagram PVCC DRSEL BOOT UGATE 20k PWM SHOOT- GATE THROUGH PHASE CONTROL LOGIC PROTECTION SOFT-START AND 10k FAULT LOGIC LGATE FN9289 Rev 6.00 Page 2 of 35 February 1, 2011 COMP VID5 FB VID6 IDROOP VID7 VDIFF FS RGND ISEN3+ VSEN ISEN3- ISEN2+ PVCC3 ISEN2- LGATE3 ISEN4+ BOOT3 ISEN4- UGATE3 EN PH4 PHASE3 PWM4 PGOOD