ISL6277HRZ Renesas

NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PART INTERSIL PART ISL6277A DATASHEET ISL6277 FN8270 Rev 1.00 Multiphase PWM Regulator for AMD Fusion Mobile CPUs Using SVI 2.0 Mar 8, 2012 The ISL6277 is fully compliant with AMD Fusion SVI 2.0 and Features provides a complete solution for microprocessor and graphics Supports AMD SVI 2.0 Serial Data Bus Interface processor core power. The ISL6277 controller supports two Voltage Regulators (VRs) with three integrated gate drivers and Dual Output Controller with Integrated Drivers two optional external drivers for maximum flexibility. The Core VR - Two Dedicated Core Drivers can be configured for 3-, 2-, or 1-phase operation while the - One Programmable Driver for Either Core or Northbridge Northbridge VR supports 2- or 1-phase configurations. The two VRs share a serial control bus to communicate with the AMD CPU Precision Voltage Regulation and achieve lower cost and smaller board area compared with - 0.5% System Accuracy Over-Temperature two-chip solutions. - 0.5V to 1.55V in 6.25mV Steps The PWM modulator is based on Intersils Robust Ripple - Enhanced Load Line Accuracy Regulator R3 Technology. Compared to traditional modulators, Supports Multiple Current Sensing Methods the R3 modulator can automatically change switching frequency - Lossless Inductor DCR Current Sensing for faster transient settling time during load transients and improved light load efficiency. - Precision Resistor Current Sensing The ISL6277 has several other key features. Both outputs Programmable 1-, 2- or 3-Phase for the Core Output and support DCR current sensing with single NTC thermistor for 1- or 2-Phase for the Northbridge Output DCR temperature compensation or accurate resistor current Adaptive Body Diode Conduction Time Reduction sensing. Both outputs utilize remote voltage sense, adjustable Superior Noise Immunity and Transient Response switching frequency, OC protection and power good. Output Current Monitor and Thermal Monitor Applications Differential Remote Voltage Sensing AMD Fusion CPU/GPU Core Power High Efficiency Across Entire Load Range Notebook Computers Programmable Slew Rate Programmable VID Offset and Droop on Both Outputs Programmable Switching Frequency for Both Outputs Excellent Dynamic Current Balance Between Phases OCP/WOC, OVP, PGOOD, and Thermal Monitor Small Footprint 48 Ld 6x6 QFN Package - Pb-Free (RoHS Compliant) Core Performance 100 1.12 90 1.10 80 V = 8V IN 1.08 70 V = 12V IN 60 1.06 V = 8V IN V = 19V IN 50 1.04 40 V = 12V 1.02 IN 30 1.00 20 V = 19V IN 10 0.98 V CORE = 1.1V OUT V CORE = 1.1V OUT 0 0.96 0 5 10 15 20 25 30 35 40 45 50 55 0 5 10 15 20 25 30 35 40 45 50 55 I (A) I (A) OUT OUT FIGURE 2. V vs LOAD FIGURE 1. EFFICIENCY vs LOAD OUT FN8270 Rev 1.00 Page 1 of 37 Mar 8, 2012 EFFICIENCY (%) V (A) OUTISL6277 Simplified Application Circuit for High Power CPU Core VIN BOOTX UGATEX NB PH1 ISEN1 NB PHASEX NB PH2 ISEN2 NB Ri LGATEX NB PH1 VNB1 VNB1 ISUMN NB Cn VNB2 NTC VNB FCCM NB ISUMP NB VIN NB PH1 NB PH2 PWM2 NB NB PH2 VNB2 COMP NB IMON NB FB NB NTC NB VR HOT L THERMAL INDICATOR VSEN NB VNB SENSE IMON PWROK NTC VIN SVT P SVD SVC VDDIO PWM Y VO3 PH3 ISL6277 COMP FB2 VIN BOOT2 FB UGATE2 VSEN VCORE PHASE2 VCORE SENSE RTN LGATE2 PH2 VO2 PH1 ISEN1 PH2 ISEN2 VIN BOOT1 PH3 ISEN3 UGATE1 Ri VO1 ISUMN PHASE1 Cn VO2 NTC VO3 LGATE1 PHPH11 VOVO11 ISUMP FIGURE 3. TYPICAL APPLICATION CIRCUIT USING INDUCTOR DCR SENSING FN8270 Rev 1.00 Page 2 of 37 Mar 8, 2012 PH1 PH2 PH3 VIN VDD GND PAD ENABLE VDDP PGOOD ISL6208 ISL6208