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Output Voltage Requirements
22 315889-002
2.9 Overshoot at Turn-On or Turn-Off - REQUIRED
The core VRM/EVRD output voltage should remain within the load-line regulation band
for the VID setting, while the VRM/EVRD is turning on or turning off, with no over or
undershoot out of regulation. No negative voltage below –100 mV may be present at
the VRM/EVRD output during turn-on or turn-off.
2.10 Output Filter Capacitance - REQUIRED
The output filter capacitance for the VRM/EVRD11.0 based designs will be located on
the baseboard. The system design must ensure that the output voltage of the VRM/
EVRD conforms to the load line of Figure 2-2 and with the baseboard and processor
loads. Table 2-7 shows the number of decoupling caps recommended and other related
specifications based on updated processor power requirements supported by VRM/
EVRD 11.0.
Figure 2-7 through Figure 2-10 are recommended examples of baseboard decoupling
solutions and processor loads. Dual-Core Intel Xeon Processor-Based Server decoupling
applies to all Dual-Core Intel Xeon Processor-Based Server/Dual-Core Intel
®
Xeon
®
Processor-Based Server/Dual-Core Intel Xeon Processor-Based Workstation platforms.
The number of capacitors needed could change based on updated processor power
requirements. The values shown are for a four to five phase 200 kHz to 700 kHz
switching 150 A I
ccMAX/130 A IccTDC voltage regulator design with an output inductor
range of 0.15 µH to 0.5 µH. The type and number of bulk decoupling required is
dependent on the voltage regulator design and it is highly recommended that the OEM
work with the VR supplier for an optimal decoupling solution for their system and in
accordance to the processor’s design requirements.
Table 2-6. Recommended Decoupling and Other Specifications for Supported
(Highest SKU) Processors - Summary
Processor
560µF
Alum-
Polymer
100µF
MLCC
10µF
MLCC
22 µF
MLCC
Slew Rate
(di/dt)
A/µs
Itdc (A)
Max Icc
(A)
Dual-Core Intel Xeon Processor-
Based Server platform 8 layer (3-
PWR 3-GND and 2 SIG)
17 54
(0805)
1200 130 150
Dual-Core Intel Xeon Processor-
Based Server platform with Intel
5000 Chipsets 6 layer (2-PWR, 2-
GND and 2-SIG), 1 oz Cu
15 44
(1206)
1200 130 150
Dual-Core Intel Xeon Processor-
Based Server platform with Intel
5000 Chipsets 8 layer (3-PWR, 3-
GND and 2-SIG), 1 oz Cu
13 44
(1206)
1200 130 150
Dual-Core Intel Xeon 5000 Series
processors with Intel 5400 Chipsets
Platform 8-Layer CRB MB
12 10 58 1000
Dual-Core Intel Xeon 7000 Series
processors with Intel 7300 Chipsets
Platform 14-Layer CRB MB
18 65 1000 130 150