| 摘要 |
A voltage down converter is provided that includes a voltage regulator and voltage driver circuit branches. The voltage regulator receives a first voltage, has a regulation node providing a regulated second voltage that is lower than the first voltage, and has a control node providing a control voltage corresponding to the second voltage. One voltage driver circuit branch receives the first voltage and includes a variable-conductivity element having a control terminal coupled to the control node for controlling a current sunk by the variable-conductivity element. This one voltage driver circuit branch has a voltage supply node supplying a down-converted voltage corresponding to the second voltage. At least one additional voltage driver circuit branch receives the first voltage and is coupled to the voltage supply node. The additional voltage driver circuit branch includes a further variable-conductivity element having a control terminal coupled to the control node for controlling a current sunk by the further variable-conductivity element, and a switching circuit for selectively enabling the further variable-conductivity element so as to keep the down-converted voltage at a prescribed value depending on the regulated second voltage.
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