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A switching regulator is preferred to a linear one when

  • A.the quiescent current of the regulator must be as small as it can possibly be
  • B.the output noise must be as low as possible
  • C.the board area available is very small
  • D.the input to output voltage ratio is large and the current appreciable

Answer: D

A linear regulator throws away the voltage difference as heat, so dropping twelve volts to three at half an ampere wastes four and a half watts. A switcher converts instead of dissipating, at the cost of noise, inductors and a higher quiescent current.

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