VRM 9.1 DC-DC Converter Design Guidelines
Table Of Contents
- 1 Electrical Specifications
- 1.1 Output Requirements
- 1.1.1 Voltage and Current - REQUIRED
- 1.1.2 Maximum Ratings - EXPECTED
- 1.1.3 Output Voltage Tolerance - REQUIRED
- 1.1.4 No-Load Operation - REQUIRED
- 1.1.5 Turn-on Response Time - EXPECTED
- 1.1.6 Overshoot and Undershoot at Turn-On or Turn-Off - REQUIRED
- 1.1.7 Converter Stability - REQUIRED
- 1.1.8 Current Sharing - REQUIRED
- 1.2 Input Voltage and Current
- 1.3 Control Inputs - REQUIRED
- 1.4 Remote Sense (VO-sen+, VO-sen-) - EXPECTED
- 1.5 Power Good Output (PWRGD) - REQUIRED
- 1.6 VRM Present (VRM-pres) - EXPECTED
- 1.7 Efficiency - PROPOSED
- 1.8 Isolation - PROPOSED
- 1.9 Fault Protection
- 1.1 Output Requirements
- 2 Module Layout Guidelines
- 3 Environmental Conditions
- 3.1 Operating Temperature - PROPOSED
- 3.2 VRM Board Temperature - REQUIRED
- 3.3 Non-Operating Temperature - PROPOSED
- 3.4 Humidity - PROPOSED
- 3.5 Altitude - PROPOSED
- 3.6 Electrostatic Discharge - PROPOSED
- 3.7 Shock and Vibration - PROPOSED
- 3.8 Electromagnetic Compatibility - PROPOSED
- 3.9 Reliability - PROPOSED
- 3.10 Safety - PROPOSED
Electrical Specifications
12 VRM 9.1 DC-DC Converter Design Guidelines
1.1.4 No-Load Operation - REQUIRED
The VRM shall operate at all load conditions from maximum current down to zero load. In practice
the VID code generated when no processors are installed (true zero-load condition) will turn off the
VRM output. During ‘no load’ conditions the VRM does not need to meet the output regulation
specifications described in Section 1.1.3, but its output must not exceed 110% of the value of the
maximum DC output voltage (VID set-point voltage), and it must not trigger over-voltage fault
detection circuitry.
When the VRM is loaded with the Icc
MIN
listed in Table 1-1, it must regulate and source current
without triggering failures or causing control signal malfunction.
Table 1-3. 64-bit Intel
®
Xeon™ Processor MP, VRM Regulation Requirements
VRM
Output
Current,
Amperes
64-bit Intel
®
Xeon™
Processor Cache
(VID = 1.125V) Remote
Sense Voltage
64-bit Intel
®
Xeon™
Processor Cache
(VID = 1.275V) Remote
Sense Voltage
VRM
Output
Current,
Amperes
64-bit Intel
®
Xeon™
Processor Cache
(VID = 1.125V) Remote
Sense Voltage
64-bit Intel
®
Xeon™
Processor Cache
(VID = 1.275V)
Remote Sense
Voltage
Vvrm
MAX
Vvrm
Min
Vvrm
MAX
Vvrm
Min
Vvrm
MAX
Vvrm
Min
Vvrm
MAX
Vvrm
Min
0 1.125 1.103 1.275 1.250 42 1.085 1.063 1.235 1.210
2 1.123 1.101 1.273 1.248 44 1.083 1.061 1.233 1.208
4 1.121 1.099 1.271 1.246 46 1.081 1.059 1.231 1.206
6 1.119 1.097 1.269 1.244 48 1.079 1.057 1.229 1.204
8 1.117 1.095 1.267 1.242 50 1.078 1.055 1.228 1.202
10 1.116 1.093 1.266 1.240 52 1.076 1.053 1.226 1.200
12 1.114 1.091 1.264 1.238 54 1.074 1.051 1.224 1.198
14 1.112 1.089 1.262 1.236 56 1.072 1.049 1.222 1.196
16 1.110 1.087 1.260 1.234 58 1.070 1.047 1.220 1.194
18 1.108 1.085 1.258 1.232 60 1.068 1.046 1.218 1.193
20 1.106 1.084 1.256 1.231 62 1.066 1.044 1.216 1.191
22 1.104 1.082 1.254 1.229 64 1.064 1.042 1.214 1.189
24 1.102 1.080 1.252 1.227 66 1.062 1.040 1.212 1.187
26 1.100 1.078 1.250 1.225 68 1.060 1.038 1.210 1.185
28 1.098 1.076 1.248 1.223 70 1.059 1.036 1.209 1.183
30 1.097 1.074 1.247 1.221 72 1.057 1.034 1.207 1.181
32 1.095 1.072 1.245 1.219 74 1.055 1.032 1.205 1.179
34 1.093 1.070 1.243 1.217 76 1.053 1.030 1.203 1.177
36 1.091 1.068 1.241 1.215 78 1.051 1.028 1.201 1.175
38 1.089 1.066 1.239 1.213 80 1.049 1.027 1.199 1.174
40 1.087 1.065 1.237 1.212 82 1.047 1.025 1.197 1.172