Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 10.1 Design Guidelines

Voltage Regulator Module (VRM) and Enterprise Voltage 3
Regulator-Down (EVRD) 10.1 Design Guidelines
Contents
1 Applications........................................................................................................................7
1.1 Introduction and Terminology ..............................................................................................7
2 Output Voltage Requirements............................................................................................9
2.1 Voltage and Current - REQUIRED.......................................................................................9
2.2 Load Line Definitions - REQUIRED ...................................................................................10
2.3 Voltage Tolerance - REQUIRED........................................................................................11
2.4 Processor Vcc Overshoot - REQUIRED............................................................................12
2.5 Stability - REQUIRED ........................................................................................................12
2.6 Processor Power Sequencing - REQUIRED .....................................................................12
2.7 Dynamic Voltage Identification (VID) - REQUIRED ...........................................................14
2.8 Overshoot at Turn-On or Turn-Off - REQUIRED ...............................................................15
2.9 Output Filter Capacitance - REQUIRED ............................................................................15
2.10 Shut-Down Response - REQUIRED..................................................................................17
3 Control Signals.................................................................................................................19
3.1 Output Enable (OUTEN) - REQUIRED..............................................................................19
3.2 Voltage Identification (VID [5:0]) - REQUIRED ..................................................................19
3.3 Differential Remote Sense (VO_SEN±) - REQUIRED.......................................................21
3.4 Load Line Select (LL0, LL1) - REQUIRED.........................................................................21
4 Input Voltage and Current ................................................................................................23
4.1 Input Voltages - EXPECTED .............................................................................................23
4.2 Load Transient Effects on Input Current - EXPECTED .....................................................23
5 Processor Voltage Output Protection...............................................................................25
5.1 Over-Voltage Protection (OVP) - PROPOSED..................................................................25
5.2 Over-Current Protection (OCP) - PROPOSED ..................................................................25
6 Output Indicators..............................................................................................................27
6.1 Power Good (Vcc_PWRGD) - PROPOSED ......................................................................27
6.2 Voltage Regulator Hot (VR_hot#) - PROPOSED...............................................................27
6.3 Load Indicator Output (Load Current) - PROPOSED ........................................................28
6.4 VRM Present (VRM_pres#) - EXPECTED.........................................................................28
7 VRM – Mechanical Guidelines .........................................................................................29
7.1 VRM Connector - EXPECTED...........................................................................................29
7.2 VRM Connector Keying .....................................................................................................29
7.2.1 Connector Keying................................................................................................29
7.2.2 Connector Pin 1 Orientation ................................................................................29
7.3 Pin Descriptions and Assignments ....................................................................................30
7.4 Mechanical Dimensions - PROPOSED .............................................................................32
7.4.1 Gold Finger Specification ....................................................................................32
8 VRM – Environmental Conditions ....................................................................................35
8.1 Operating Temperature - PROPOSED ..............................................................................35
8.2 VRM Board Temperature - REQUIRED.............................................................................35
8.3 Non-Operating Temperature - PROPOSED ......................................................................35
8.4 Humidity - PROPOSED .....................................................................................................35