Patent ID: 10333381

Abstract:
A high voltage start-up circuit includes a power supply terminal configured to supply power, a latch unit connected to the power supply terminal and comprising a first P-type Metal-Oxide-Semiconductor (PMOS) transistor, a first N-type metal-oxide semiconductor (NMOS) transistor connected to the first PMOS transistor, a second PMOS transistor, and a second NMOS transistor connected to the second PMOS transistor, wherein the transistors form a latch structure, a charge sharing unit comprising a first capacitor configured to supply a first voltage to a drain of the second PMOS transistor and a second capacitor configured to supply a second voltage to a drain of the first PMOS transistor, and a switching unit configured to form a current path that charges an external capacitor using a voltage supplied from the power supply terminal as a power voltage, based on the first voltage and the second voltage.