PDF《Voltage Regulator Module (VRM) and》

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321736 Revision:

002 Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.

1 Design Guidelines September

2009 2 Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1 Design Guidelines INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL? PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'

S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked reserved or undefined. Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The Intel Xeon Processor

5500 Series, processors in the Intel Xeon

5500 Platform platforms may contain design defects or errors known as errata, which may cause the product to deviate from published specifications. Current characterized errata are available upon request. No computer system can provide absolute security under all conditions. Intel? Trusted Execution Technology (Intel? TXT) requires a computer system with Intel? Virtualization Technology, an Intel TXT-enabled processor, chipset, BIOS, Authenticated Code Modules and an Intel TXT-compatible measured launched environment (MLE). The MLE could consist of a virtual machine monitor, an OS or an application. In addition, Intel TXT requires the system to contain a TPM v1.2, as defined by the Trusted Computing Group and specific software for some uses. For more information, see http://www.intel.com/technology/security/. Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order. Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling1-800-548-4725, or by visiting Intel'

s website at http://www.intel.com. Intel, Intel Xeon and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. * Other brands and names may be claimed as the property of others. Copyright ? 2009, Intel Corporation. All rights reserved. Notice: This document contains information on products in the design phase of development. The information here is subject to change without notice. Do not finalize a design with this information. Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1 Design Guidelines

3 Contents

1 Applications.7 1.1 Introduction and Terminology

7 2 Output Voltage Requirements.9 2.1 Voltage and Current C REQUIRED

9 2.1.1 Max Load Step Size as function of Load Step Repetition Rate.10 2.2 Load Line Definitions C REQUIRED

12 2.3 Output Voltage Tolerance C REQUIRED.13 2.4 Processor VCC Max Allowed Overshoot C REQUIRED.14 2.5 Impedance versus Frequency C EXPECTED.15 2.6 Stability C REQUIRED.16 2.7 Processor Power Sequencing C REQUIRED