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315889-002 3
Contents
1Applications...............................................................................................................9
1.1 Introduction and Terminology ...............................................................................9
2 Output Voltage Requirements.................................................................................. 11
2.1 Voltage and Current - REQUIRED......................................................................... 11
2.2 Load Line Definitions - REQUIRED........................................................................ 13
2.3 Voltage Tolerance - REQUIRED............................................................................ 15
2.4 Processor VCC Overshoot - REQUIRED ................................................................. 16
2.5 Impedance vs. Frequency - EXPECTED ................................................................. 16
2.6 Stability - REQUIRED ......................................................................................... 18
2.7 Processor Power Sequencing - REQUIRED............................................................. 18
2.8 Dynamic Voltage Identification (D-VID) - REQUIRED .............................................. 20
2.9 Overshoot at Turn-On or Turn-Off - REQUIRED...................................................... 22
2.10 Output Filter Capacitance - REQUIRED ................................................................. 22
2.11 Shut-Down Response - REQUIRED....................................................................... 26
3 Control Signals ........................................................................................................ 27
3.1 Output Enable (OUTEN) - REQUIRED.................................................................... 27
3.2 Voltage Identification (VID [6:0]) - REQUIRED ...................................................... 27
3.3 Differential Remote Sense (VO_SEN+/-) - REQUIRED............................................. 29
3.4 Load Line Select (LL0, LL1, VID_Select) - REQUIRED ............................................. 31
4 Input Voltage and Current ....................................................................................... 33
4.1 Input Voltages - EXPECTED ................................................................................ 33
4.2 Load Transient Effects on Input Current - EXPECTED.............................................. 33
5 Processor Voltage Output Protection ....................................................................... 35
5.1 Over-Voltage Protection (OVP) - EXPECTED .......................................................... 35
5.2 Over-Current Protection (OCP) - EXPECTED .......................................................... 35
6 Output Indicators .................................................................................................... 37
6.1 Voltage Regulator Ready (VR_Ready) - REQUIRED................................................. 37
6.2 Voltage Regulator Hot (VR_hot#) - PROPOSED...................................................... 37
6.3 Load Indicator Output (Load_Current) - PROPOSED ............................................... 38
6.4 VRM Present (VRM_pres#) - EXPECTED................................................................ 38
6.5 VR_Identification (VR_ID#) - EXPECTED .............................................................. 38
7 VRM – Mechanical Guidelines................................................................................... 41
7.1 VRM Connector - EXPECTED................................................................................ 41
7.2 VRM (Tyco/Elcon) Connector Keying .................................................................... 41
7.2.1 Connector Keying................................................................................... 41
7.2.2 Connector Pin 1 Orientation ..................................................................... 41
7.3 Pin Descriptions and Assignments........................................................................ 41
7.4 Mechanical Dimensions - PROPOSED.................................................................... 43
7.4.1 Gold Finger Specification ......................................................................... 43
8 Environmental Conditions........................................................................................ 45
8.1 Operating Temperature - PROPOSED ................................................................... 45
8.2 VRM Board Temperature - REQUIRED .................................................................. 45
8.3 Non-Operating Temperature - PROPOSED............................................................. 45
8.4 Humidity - PROPOSED ....................................................................................... 45
8.5 Altitude - PROPOSED ......................................................................................... 46
8.6 Electrostatic Discharge - PROPOSED .................................................................... 46
8.7 Shock and Vibration - PROPOSED ........................................................................ 46
8.8 Electromagnetic Compatibility - PROPOSED........................................................... 46
8.9 Reliability - PROPOSED ...................................................................................... 46