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Voltage Regulator-Down (VRD) 10.1 Design Guide

ManualsBrandsIntel ManualsOtherIntel Pentium 4 Processor supporting HT Technology 3.00E GHz, 1M Cache, 800 MHz FSB
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Input Voltage and Current
R
Design Guide
49
7 Input Voltage and Current
7.1 Input Voltages (EXPECTED)
VRD 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 Desktop Input Voltages
The main power source for the Vcc VRD is 12 V ±15% and 3.3 V for the Vtt supply. These
voltages are supplied by an AC-DC power supply through a cable to the motherboard. For input
voltages outside the normal operating range, the VRD should either operate properly or shut
down. The 1 A/
µs slew rate specification for the input current is no longer a design requirement.
Intel recommends a DC-DC regulator input filter with a minimum 1000
µF to ensure proper
loading of the 12 V power source.
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