Patent ID: 9024660
Filing Date: 2015-05-05
Classification: H03K

Abstract:
1. A driving circuit, comprising: a) a linear regulating circuit configured to receive an input voltage source, and to provide an output voltage based on a first current; b) a first power switch configured to receive said output voltage of said linear regulating circuit and an external enable signal, and to generate an internal enable signal configured to drive a logic circuit; and c) a start-up circuit configured to receive said external enable signal at a gate of a second power switch, wherein when said external enable signal is lower than a threshold voltage that is related to said second power switch, said start-up circuit is configured to disable said first current and said driving circuit, and when said external enable signal is higher than said threshold voltage, said start-up circuit is configured to generate said first current and enable said driving circuit, wherein said start-up circuit comprises a first resistor connected to said second power switch at a node having no other connections thereto.