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  Tiny DC/DC Buck Controller Provides High Efficiency and Low Ripple &mdash LT Journal
  PDF, 421 Kb, Archivo publicado: marzo 28, 2006
  Extracto del documento

  DESIGN IDEAS Tiny DC/DC Buck Controller Provides
  High Efficiency and Low Ripple by Theo Phillips Introduction Circuit Description
  Figure 1 shows a typical application
  for the LTC3772. This circuit provides
  a regulated output of 2.5V from a typical input voltage of 5V, but it can also
  be powered from any input voltage
  between 2.75V and 9.8V (depending
  on the voltage rating of the P-channel
  power MOSFETs). This wide input
  range makes the LTC3772 suitable for
  a variety of input supplies, including
  1-and 2-cell Li-Ion and 9V batteries, as
  well as 3.3V and 5V supply rails. The
  internal soft-start ramps the output
  voltage smoothly from 0V to its п¬Ѓnal
  value in 1ms (Figure 2).
  At low load currents (≤10% of IMAX),
  the LTC3772 enters Burst Mode operation. Compared with other power
  saving schemes, this variant of Burst
  Mode operation surrenders a modicum
  of efficiency to obtain very low output
  voltage ripple. Typically producing
  just 30mV for a typical application …

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

Otros nombres:

LTC3772EDDBPBF, LTC3772EDDB PBF