Voltage Regulator Module (VRM) 10.2L Design Guidelines

Voltage Regulator Module (VRM) 10.2L Design Guidelines 3
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 Stability - REQUIRED ........................................................................................................12
2.5 Processor Power Sequencing - REQUIRED .....................................................................12
2.6 Dynamic Voltage Identification (VID) - REQUIRED ...........................................................13
2.7 Overshoot at Turn-On or Turn-Off - REQUIRED ...............................................................15
2.8 Output Filter Capacitance - REQUIRED ............................................................................15
2.9 Shut-Down Response - REQUIRED..................................................................................16
3 Control Signals.................................................................................................................17
3.1 Output Enable (OUTEN) - REQUIRED..............................................................................17
3.2 Voltage Identification (VID [5:0]) - REQUIRED ..................................................................17
3.3 Differential Remote Sense (VO_SEN±) - REQUIRED.......................................................19
3.4 Load Line Select (LL0, LL1) - REQUIRED.........................................................................19
4 Input Voltage and Current ................................................................................................21
4.1 Input Voltages - EXPECTED .............................................................................................21
4.2 Load Transient Effects on Input Current - EXPECTED .....................................................21
5 Processor Voltage Output Protection...............................................................................23
5.1 Over-Voltage Protection (OVP) - PROPOSED..................................................................23
5.2 Over-Current Protection (OCP) - PROPOSED ..................................................................23
6 Output Indicators..............................................................................................................25
6.1 Power Good (Vcc_PWRGD) - PROPOSED ......................................................................25
6.2 Voltage Regulator Hot (VR_hot#) - PROPOSED...............................................................25
6.3 Load Indicator Output (Load Current) - PROPOSED ........................................................26
6.4 VRM Present (VRM_pres#) - EXPECTED.........................................................................26
7 VRM – Mechanical Guidelines .........................................................................................27
7.1 VRM Connector - EXPECTED...........................................................................................27
7.2 VRM Connector Keying .....................................................................................................27
7.2.1 Connector Keying................................................................................................27
7.2.2 Connector Pin 1 Orientation ................................................................................27
7.3 Pin Descriptions and Assignments ....................................................................................27
7.4 Mechanical Dimensions - PROPOSED .............................................................................30
7.4.1 Gold Finger Specification ....................................................................................30
8 VRM – Environmental Conditions ....................................................................................33
8.1 Operating Temperature - PROPOSED ..............................................................................33
8.2 VRM Board Temperature - REQUIRED.............................................................................33
8.3 Non-Operating Temperature - PROPOSED ......................................................................33
8.4 Humidity - PROPOSED .....................................................................................................33
8.5 Altitude - PROPOSED .......................................................................................................33