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  Efficient Dual Polarity Output Converter Fits into Tight Spaces &mdash DN318
  PDF, 82 Kb, Datei veröffentlicht: Aug 2, 2003
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  advertisement Efficient Dual Polarity Output Converter Fits into Tight Spaces
  Design Note 318
  Keith Szolusha
  Introduction
  This Design Note describes a compact and efficient ±5V
  output dual polarity converter that uses a single buck
  regulator. The topology shown features 3mm maximum
  circuit height, high efficiency and low output voltage
  ripple on a 5V output—important considerations for
  many battery-powered, handheld and noise-sensitive
  devices. This combination of features is not easily
  achievable with other commonly used dual polarity
  topologies. For instance, one alternative topology, a
  flyback converter using a boost regulator, is relatively
  inefficient, requires a bulky (5mm or taller) transformer
  and generates high output voltage ripple. Another alternative, using two buck regulators, incurs both the
  cost of the additional regulator and the cost of the PCB
  real estate it occupies.
  The single buck regulator topology shown here requires
  few components. To reduce the maximum circuit height,
  it uses two power inductors instead of a transformer.
  In the absence of the transformer core, the coupling
  capacitor allows energy to pass between the positive …

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• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Internal Power Switch Buck | High Input Voltage Buck

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LT3431EFEPBF, LT3431EFE PBF