LEVEL SHIFT CIRCUIT AND DC-DC CONVERTER FOR USING THE SAME

摘要

A level shift circuit and a DC-DC buck converter controller for using the same are disclosed. The level shift circuit is capable of detecting a state of a converting circuit, and avoids a current leakage when determining that the converting circuit is operating under a light-load. Therefore, the level shift circuit and the DC-DC converting controller provided by the present invention can reduce power consumption under the light-load and have power-saving advantage.

主权项

1. A level shift circuit, comprising:
a signal input circuit, coupled between a first level and a second level, configured to receive a first input signal and a second input signal, and levels of the first input signal and the second input signal being switched between the first level and a third level, wherein the signal input circuit generates a first current when the first input signal is at the third level and generates a second current when the second input signal is at the third level; a signal output circuit, coupled between the second level and a fourth level, configured to output a first output signal and a second output signal, and levels of the first output signal and the second output signal being switched between the second level and the fourth level, wherein the first output signal is switched to the second level when the signal input circuit generates the first current, and the second output signal is switched to the second level when the signal input circuit generates the second current; and a state detecting circuit, detecting an operating state of a converting circuit, and accordingly determining whether generating a stop signal for stopping the signal input circuit generating the first current and the second current.