Voltage generating apparatus capable of recovering output voltage

摘要

A voltage generating apparatus according to an embodiment of the present invention includes a voltage regulator determining a pass voltage at a pass node by comparing an output voltage at an output node with a reference voltage, and generating the output voltage by transferring an external power supply voltage to the output node in response to the pass voltage at the pass node, and a voltage stabilizer controlling a first current flowing from the pass node and a second current flowing from the output node in response to the output voltage.

主权项

1. A voltage generating apparatus, comprising:
a voltage regulator suitable for determining a pass voltage at a pass node by comparing a feedback voltage based on an output voltage at an output node with a reference voltage, and generating the output voltage by transferring an external power supply voltage to the output node in response to the pass voltage at the pass node; and a voltage stabilizer suitable for controlling a first current flowing from the pass node and a second current flowing from the output node in response to the output voltage, wherein the voltage stabilizer comprises:
a voltage comparison unit suitable for generating a first comparison signal and a second comparison signal by comparing the output voltage at the output node with the reference voltage;a first current generation unit suitable for controlling the first current in response to the first comparison signal; anda second current generation unit suitable for controlling the second current in response to the second comparison signal, and wherein the voltage comparison unit comprises;
a first comparison transistor suitable for receiving the output voltage at the output node through a gate thereof;a second comparison transistor suitable for receiving the reference voltage through a gate thereof;a third comparison transistor having a source coupled to a node of the external power supply voltage and a drain coupled to the first comparison transistor;a fourth comparison transistor having a source coupled to the node of the external power supply voltage and a drain coupled to the second comparison transistor; anda driving transistor having a drain coupled to a source of the first comparison transistor and a source of the second comparison transistor, wherein the first comparison transistor and the second comparison transistor are NMOS transistors, the third comparison transistor and the fourth comparison transistor are PMOS transistors, and a gate of the third comparison transistor is coupled to a gate of the fourth comparison transistor.