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  Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs &mdash DN311
  PDF, 79 Kb, 档案已发布: May 2, 2003
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  advertisement Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs
  Design Note 311
  Haresh Patel
  Introduction
  FPGAs often require multiple power supplies: one for
  the core voltage (usually 1.8V, but sometimes as low as
  1.2V) and at least one more for the I/O circuitry (often
  2.5V). The available input supply is either 3.3V or 5V.
  One way to provide the multiple step-down conversions
  is via multiple switcher-based power supplies; however,
  this may be more complicated and cumbersome than
  is warranted, especially if the I/O does not draw much
  current. In such instances, the dual output LTC В®1704
  is a simple and space-saving option. It can supply two
  voltages with its versatile high frequency switcher and
  its space-saving LDO controller.
  Circuit Description
  With a 5V input, the switcher channel can generate core
  voltages from 0.8V to 3.3V at currents up to 15A. This
  550kHz switcher reduces required LC п¬Ѓlter size while
  VIN
  5V + C6 1ОјF 1
  R2 …

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制造商分类

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers | Buck Regulator Plus LDO

其他名称:

LTC1704BEGNTRPBF, LTC1704BEGN TRPBF