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

Embedded Voltage Regulator-Down (EmVRD) 11.0
January 2007 Design Guidelines for Embedded Implementations
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7.0—EmVRD 11.0
7.0 Input Voltage and Current
7.1 Input Voltages
EmVRD output voltage is supplied via DC-to-DC power conversion. To ensure proper
operation, the input supplies to these regulators must satisfy the following conditions.
7.1.1 Platform Input Voltages
The most common power source for the Vcc EmVRD is 12 V ±15% and 3.3 V or 5 V for
the V
CCP
supply. These voltages are supplied by an AC-DC power supply through
cabling to the motherboard inputs. For input voltages outside the normal operating
range, the EmVRD should either operate properly or shut down. The 1 A/
µs slew rate
specification for the input current is no longer a design requirement. For the VRD
supply Intel recommends a DC-DC regulator input filter with a minimum of 1000
µF to
ensure proper loading of the 12 V power source.