Voltage regulator for high speed switching of voltages

摘要

According to one embodiment, a voltage regulator includes an output transistor, a voltage detector, a controller, and a discharge circuit. The output transistor is connected between a power supply terminal and an output terminal. The voltage detector is connected between the output terminal and a ground terminal. The voltage detector is configured to divide an output voltage between the output terminal and the ground terminal according to an inputted voltage switching signal and generates a first voltage on the ground terminal side and a second voltage having a polarity the same as a polarity of the first voltage and having an absolute value lower than or equal to an absolute value of the first voltage. The controller is configured to detect a difference between the first voltage and a reference voltage and control the output transistor.

主权项

1. A voltage regulator comprising:
an output transistor connected between a power supply and an output connected to a capacitor; a voltage detector connected between the output and a ground, the voltage detector being configured to divide an output voltage into a first voltage and a second voltage according to a switching signal, the output voltage being a voltage between the output and the ground, the second voltage having a polarity the same as a polarity of the first voltage and having an absolute value lower than or equal to an absolute value of the first voltage; a controller configured to detect a difference between the first voltage and a reference voltage to be a reference of the output voltage generated at the output and control the output transistor so as to reduce the difference; and a discharge circuit connected between the output and the ground, the discharge circuit configured to discharge electric charges of the capacitor from the output to the ground when the absolute value of the second voltage after a change of the switching signal is higher than an absolute value of the reference voltage.