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The quiescent current of the voltage regulator feeding a microcontroller matters because

  • A.it sets the ripple on the supply rail
  • B.it fixes the start-up time after power is applied
  • C.it flows even when the microcontroller is asleep
  • D.it determines the largest current the processor core is able to draw from it

Answer: C

A part sleeping at two microamperes behind a regulator drawing fifty is a design sleeping at fifty-two, and the effort spent on the microcontroller is wasted. Low quiescent regulators, or running direct from the cell, are the answers.

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