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  High Efficiency DDR Termination Power Supplies Source and Sink More than 10 Amps &mdash LT Journal
  PDF, 205 Kb, 档案已发布: Mar 1, 2002
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  DESIGN FEATURES High Efficiency DDR Termination
  Power Supplies Source and Sink
  More than 10 Amps
  by Wei Chen
  Introduction
  The emerging standard for system
  memory in computing and communication systems is Double Data Rate
  (DDR) memory. Typical DDR memory
  needs at least two main power supplies: VDD and VTT, where VDD powers
  the I/O, and VTT powers the I/O termination. To ensure good signal
  quality and fast data rate, the termination power supply VTT must always
  track the VDD supply with VTT = VDD/
  2. Since the termination resistors can
  carry current in either direction, the
  VTT power supply must be able to
  both source and sink current while
  tracking the VDD supply. A typical
  DDR termination power supply for a
  PC application requires 2A to 10A of
  current. In servers, high power workstations or broadband networking
  equipment applications, the DDR termination supply current may well
  exceed 10A. At these current levels, a
  linear regulator is not a viable solu-VDD …

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• Power Management > Switching Regulator > DDR Memory/Bus Termination

其他名称:

LTC3831EGNTRPBF, LTC3831EGN TRPBF