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  2MHz Dual Buck Regulator Operates Outside of AM Radio Band When Delivering 3.3V and 1.8V from 16V Input &mdash LT Journal
  PDF, 723 Kb, Datei veröffentlicht: Apr 1, 2010
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  2MHz Dual Buck Regulator Operates Outside of AM Radio
  Band When Delivering 3.3V and 1.8V from 16V Input
  Pit-Leong Wong The number of microprocessor-based control units continues
  to grow in both automobiles and industrial systems. Because
  the amount of required processing power is also increasing,
  even modest processors require a low voltage core supply
  in addition to 3.3V or 5V memory, I/O and analog supplies.
  In automotive systems, power comes
  from the battery, with its voltage typically between 9V and 16V. Including cold
  crank and double battery jump-starts, the
  minimum input voltage may be as low
  as 4V and the maximum up to 36V, with
  even higher transient voltages. Likewise,
  a 24V industrial supply may be as high
  as 32V. With these high input voltages,
  linear regulators cannot be used for supply currents greater than 200mA without
  overheating the regulator. Instead, high
  efficiency switching regulators must be
  used to minimize thermal dissipation.
  There are challenges in applying switching regulators in these systems. A small
  circuit is desired, and certain operating
  frequencies may be unacceptable. At
  high step-down ratios, switching regulators typically operate at frequencies in …

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• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | Internal Power Switch Buck

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LT3640IFEPBF, LT3640IFE PBF