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A linear regulator's efficiency is approximately

  • A.the output voltage divided by the input voltage
  • B.independent of the two voltages
  • C.the input voltage divided by the output voltage
  • D.the ratio of the quiescent to the load current

Answer: A

The same current flows in and out, so the power ratio is the voltage ratio: dropping 5 V to 3.3 V is at best sixty-six per cent efficient. That is why a linear part is used for small drops and small currents and a switcher for anything else.

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