Embedded Voltage Regulator-Down (EmVRD) 11.0 Design Guidelines for Embedded Implementations Supporting PGA478

EmVRD 11.0—5.0
Embedded Voltage Regulator-Down (EmVRD) 11.0
Design Guidelines for Embedded Implementations January 2007
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5.0 EmVRD Current Support
System boards supporting processors must have voltage regulator designs compliant to
electrical and thermal standards defined in Table 4. This includes full electrical support
of Iccmax specifications and regulator layout, processor fan selection, ambient
temperature, chassis configuration, etc. Consult Table 4 and Table 9 for processor V
CC
and V
CCP
current limits.
To avoid heat related failures, embedded computer systems should be validated for
thermal compliance under the envelope of system operating conditions using metrology
in the Dual-Core Intel
®
Xeon
®
Processor LV and ULV Thermal Design Guide for
Embedded Systems (see Section 1.3).
5.1 Phase Count Requirement
A EmVRD controller will be used in DC-DC converters that support processors up to 36A
I
CC
. It is expected that the controller chip manufacturer will determine the optimal
number of phases for a low-cost design and allow for flexible implementations to meet
various market segment requirements. Initial Intel studies show that a two or three
phase VR design should meet all the requirements. The specific design environment
should dictate which approach is used.