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Comparing a part with an on-chip regulator against one requiring an external LDO, the on-chip version

  • A.always consumes less total power in every mode
  • B.removes the need for supply decoupling capacitors
  • C.allows a wider operating temperature range
  • D.reduces the component count at some cost in flexibility

Answer: D

One fewer device and its passives is a real saving in board area and assembly, but the regulator's characteristics are then fixed and its quiescent current cannot be chosen. Decoupling is needed either way and the temperature grade is unaffected.

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