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  Ultralow Power Converter’s Control Scheme Eliminates Audible Switching Noise &mdash DN1019
  PDF, 554 Kb, Datei veröffentlicht: Nov 10, 2010
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  advertisement Ultralow Power Converter’s Control Scheme Eliminates Audible
  Switching Noise – Design Note 1019
  James Yasuhara
  Introduction
  An essential component of a noise-free audio device is
  a clean power supply, but few switching regulators can
  operate at high efficiency while keeping the switching
  frequency out of the audio band. The LTC В®3620 fills this
  void. It is a high efficiency 15mA buck regulator with a
  programmable minimum switching frequency, making it
  possible to virtually eliminate audible switching noise. The
  internal synchronous switches and low quiescent current
  of this buck regulator provide the ability to maintain high
  efficiency, while its small footprint makes it ideal for tiny,
  low power audio applications.
  Operation
  To maximize efficiency, the LTC3620 employs a variable
  frequency architecture that adjusts its switching frequency
  to match the load current. Of course, a variable frequency
  scheme is a potential noise problem for an audio device
  if the switching frequency is allowed to enter the audio
  spectrum. The LTC3620 avoids this problem by locking
  its frequency to a user-set minimum value for low load …

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

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LTC3620EDCPBF, LTC3620EDC PBF