Patent ID: 7939883

Claim:
A voltage regulating apparatus comprising: a reference voltage generator for regulating a supply voltage and providing a reference voltage; a voltage comparator comprising a first metal-oxide-semiconductor field-effect transistor (MOSFET) for receiving the reference voltage via a gate, a second MOSFET having a source connected to a drain of the first MOSFET and a drain to which the supply voltage is applied, a third MOSFET having a gate connected to a gate of the second MOSFET, a drain to which the supply voltage is applied, and a source electrically connected with the gate, and a fourth MOSFET having a drain connected to the source of the third MOSFET and a source connected to a source of the first MOSFET, the voltage comparator configured to compare the reference voltage with a voltage of a gate of the fourth MOSFET; a current sinker comprising a first current sink unit connected to the sources of the first MOSFET and the fourth MOSFET to form a current sink and a second current sink unit connected to the sources of the first MOSFET and the fourth MOSFET to form a current sink and to operate according to a voltage of the gate of the fourth MOSFET; and a voltage output unit comprising a fifth MOSFET having a gate connected to the drain of the first MOSFET, a drain to which the supply voltage is applied, and a source connected to the gate of the fourth MOSFET and to provide a voltage of the source of the fifth MOSFET as an output voltage; wherein the second current sink comprises: an inverter connected to the gate of the fourth MOSFET for inverting the voltage of the gate of the fourth MOSFET; and a MOSFET having a drain connected to the sources of the first MOSFET and the fourth MOSFET, a source grounded, and a gate to which the inverted voltage is applied.