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  Monolithic Buck Regulator Operates Down to 1.6V Input &mdash LT Journal
  PDF, 151 Kb, Datei veröffentlicht: Nov 22, 2006
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  DESIGN IDEAS L Monolithic Buck Regulator Operates
  by Gregg Castellucci
  Down to 1.6V Input VIN FOR PULSE SKIP MODE
  GND FOR Burst ModeВ®
  OPERATION 1 4 MODE 70 EFFICIENCY (%) 60 50 50 40 40 30 30 20
  10 0
  0.1 1 10
  100
  LOAD CURRENT (mA) VIN = 1.8V
  VIN = 2.5V 0
  1k VIN = 3.1V
  POWER LOSS
  AT VIN = 2.5V Figure 1. Efficiency vs load current for
  the LTC3549 in Burst Mode operation voltage in about 1ms. For instance,
  the average output current required
  during soft-start to charge a 10ВµF
  output capacitor to 1.8V in 1ms is
  18mA. The total output current is the
  sum of the output capacitor charging
  current and the current delivered to
  the load as VOUT ramps up. Without
  soft-start, the average current during
  startup could be as high as Ilimit, which …

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

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LTC3549EDCBPBF, LTC3549EDCB PBF