Voltage Regulator-Down (VRD) 10.1 Design Guide

R
4 Design Guide
8.1
Over-Voltage Protection (OVP) (PROPOSED).................................................51
8.2 Over-Current Protection (OCP) (PROPOSED).................................................51
9 Output Indicators...............................................................................................................53
9.1 VCC_PWRGD: Vcc Power Good Output (PROPOSED)..................................... 53
9.2 VTTPWRGD: Vtt Power Good Output (REQUIRED)..........................................53
9.2.1 VTTPWRGD Electrical Specifications ..................................................53
9.3 Example VTTPWRGD Circuit............................................................................... 54
9.4 PROCHOT# and VRD Thermal Monitoring (EXPECTED)................................... 55
9.5 Load Indicator Output (EXPECTED).................................................................58
10 Motherboard Power Plane Layout ....................................................................................59
10.1 Minimize Power Path DC Resistance (EXPECTED) ...........................................59
10.2 Minimize Power Delivery Inductance (EXPECTED) ...........................................59
10.3 Four-Layer Boards (EXPECTED) ................................................................59
10.4 Six-Layer Boards (EXPECTED).................................................................. 63
10.5 Resonance Suppression (EXPECTED) ...........................................................63
11 Electrical Simulation..........................................................................................................65
12 Appendix: LGA775 Version 1 Pinmap .............................................................................75