Datasheet ISL62776 Multiphase PWM Regulator for AMD CPUs Using SVI2 The ISL62776 is fully compliant with AMD Serial VID Features Interface 2.0 (SVI2) and provides a complete solution Supports AMD SVI 2.0 serial data bus interface for microprocessor and graphics processor core Serial VID clock frequency range: 100kHz to power. The ISL62776 controller supports two Voltage 25MHz Regulators (VRs) that use external drivers for maximum flexibility. The Core VR can be configured Dual output controller with PWM output for 4-, 3-, 2-, or 1-phase operation and the SOC VR Precision voltage regulation supports 1-phase operation. The two VRs share a serial control bus to communicate with the AMD CPU 0.5% system accuracy over-temperature and achieve lower cost and smaller board area 0.5V to 1.55V in 6.25mV steps compared with two-chip solutions. Enhanced load-line accuracy The R3 modulator, based on the Renesas Robust Supports multiple current sensing methods Ripple Regulator (R3) technology, has many advantages compared to traditional modulators. Lossless inductor DCR current sensing These include faster transient settling time, variable Precision resistor current sensing switching frequency in response to load transients, Programmable phase operation for both Core and and improved light-load efficiency due to diode SOC VR outputs emulation mode with load-dependent, low-switching frequency. Superior noise immunity and transient response Both outputs of the ISL62776 support DC Resistance Output current and voltage telemetry (DCR) current sensing with single NTC thermistor for Differential remote voltage sensing DCR temperature compensation or accurate resistor current sensing. Both outputs use remote voltage High efficiency across entire load range sense, adjustable switching frequency, Overcurrent Programmable slew rate Protection (OCP), and power-good. Programmable VID offset and droop on both outputs Applications Programmable switching frequency for both outputs AMD CPU/GPU core power Excellent dynamic current balance between phases Notebook computers Protection: OCP/WOC, OVP, PGOOD, and thermal Related Literature monitoring For a full list of related documents, visit our website: Small footprint 40 Ld 5x5 TQFN package ISL62776 device page Pb-free (RoHS compliant) 0.850 0.800 0.750 Core Core SOC SOC 0.700 0.650 0.600 0 20406080 100 120 Load Current (A) Figure 1. Output Voltage vs Load R16DS0044EU0200 Rev.2.00 Page 1 of 49 Oct.8.20 Output Voltage (V)ISL62776 Contents 1. Overview . 4 1.1 Simplified Application Circuits 4 1.2 Block Diagram 7 1.3 Ordering Information . 8 1.4 Pin Configuration 8 1.5 Pin Descriptions . 8 2. Specifications 10 2.1 Absolute Maximum Ratings . 10 2.2 Thermal Information . 10 2.3 Recommended Operating Conditions . 10 2.4 Electrical Specifications 10 3. Theory of Operation . 13 3.1 Multiphase R3 Modulator . 13 3.2 Standard Buck Operation During Soft-Start . 15 3.3 Diode Emulation and Period Stretching 15 3.4 Channel Configuration . 16 3.5 Power-On Reset . 17 3.6 Start-Up Timing 17 3.7 Voltage Regulation and Load Line Implementation . 18 3.8 Differential Sensing . 19 3.9 Phase Current Balancing . 19 3.10 Modes of Operation . 23 3.11 Dynamic Operation . 23 4. Resistor Configuration Options . 24 4.1 VR Offset Programming 24 4.2 VID-on-the-Fly Slew Rate Selection 24 4.3 CCM Switching Frequency . 24 5. AMD Serial VID Interface 2.0 26 5.1 Pre-PWROK Metal VID 26 5.2 SVI Interface Active . 26 5.3 VID-on-the-Fly Transition . 27 5.4 SVI Data Communication Protocol . 27 5.5 SVI Bus Protocol . 29 5.6 Power States 30 5.7 Dynamic Load Line Slope Trim 30 5.8 Dynamic Offset Trim 31 6. Telemetry . 32 7. Protection Features . 33 7.1 Overcurrent . 33 7.2 Current Balance 33 7.3 Undervoltage 33 7.4 Overvoltage . 33 7.5 Thermal Monitor (NTC, NTC SOC) . 34 7.6 Fault Recovery . 35 7.7 Interface Pin Protection 35 R16DS0044EU0200 Rev.2.00 Page 2 of 49 Oct.8.20