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  Step-Down Synchronous Controller Operates from Inputs Down to 2.2V &mdash DN443
  PDF, 96 Kb, Archivo publicado: mayo 28, 2008
  Extracto del documento

  Step-Down Synchronous Controller Operates from Inputs Down
  to 2.2V
  Design Note 443
  Wei Gu
  Introduction
  Many telecommunications and computing applications
  need high efficiency step-down DC/DC converters that
  can operate from a very low input voltage. The high
  output power synchronous controller LT3740 is ideal
  for these applications, converting input supplies ranging
  from 2.2V to 22V to outputs as low as 0.8V with load
  currents from 2A to 20A. Applications include distributed
  power systems, point-of-load regulation and conversion
  of logic supplies.
  A major challenge in designing a step-down converter
  with low VIN is that the gate voltage for the N-channel
  MOSFETs is not readily available. The LT3740 solves
  this problem by integrating a DC/DC step-up converter
  for generating its own MOSFET gate drive voltage with
  a small inexpensive external inductor. This function
  permits the use of inexpensive off-the-shelf 5V gatedrive MOSFETs, offering up to 3% higher efficiency than
  sub-logic gate-drive MOSFETs and eliminating the need
  for a secondary supply. …

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