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Voltage Regulator Module, Enterprise Voltage Regulator-Down 10.0Design Guidelines, July 2005 This document defines DC-to-DC converters designed to help meet the power requirements of the Intel® Xeon™ processor with 800 MHz system bus and Low Voltage Intel® Xeon™ processor with 800 MHz system bus. The intent of this document is to define the electrical, thermal, and mechanical specifications for VRM 10.0. VRM – The Voltage Regulator Module (VRM) designation in this document refers to a voltage regulator that is plugged into a baseboard where the baseboard is designed to support more than one processor. VRM output requirements in this document are intended to match the needs of a set of microprocessors. EVRD – The Enterprise Voltage Regulator-Down (EVRD) designation in this document refers to a voltage regulator that is embedded in a baseboard where the baseboard is designed to support more than one processor. EVRD output requirements in this document are intended to match the needs of a set of microprocessors. Each implementation of a specific baseboard must meet the specifications of all processors supported by the baseboard. The specifications in the respective processors’ datasheet always take precedence over the data provided in this document. VRM/EVRD 10.0 incorporates functional changes from prior VRD and VRM guidelines: • Vcc and Vtt supplies are separate (the Vtt specifications are included in the respective processors’ datasheet). • Addition of a continuous load current (ICC (TDC)) to enable cost effective VRM/EVRD designs (Section 2.1). • Addition of dynamic VID to change the output voltage during normal operation in response to an input from the processor (Section 2.7). • Simplified definition of power-good as a power-up indication (Section 6.1). • Extended use of the VRM/EVRD disable function to turn off the output in response to an input from the processor (Section 3.1). • Specifications added to monitor and react to excessive temperature in the voltage regulator (VR) (Section 6.2) Read the full Voltage Regulator Module, Enterprise Voltage Regulator-Down 10.0 Design Guidelines.
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