Power supply chip and liquid crystal display device

The utility model discloses a power supply chip and a liquid crystal display device, and the power supply chip comprises a control chip which receives an input voltage; the power supply receives an input voltage to output a power supply voltage signal; the control signal generation circuit is connected between the power supply and the ground, receives a power supply voltage signal and a backlight enable signal, provides a first control signal or a second control signal to the outside according to the backlight enable signal, provides a feedback signal to the control chip and is controlled by the control chip, and the backlight enable signal represents the level state of the backlight source and provides the feedback signal to the control chip. The second control signal has a higher level value than the first control signal. The power supply chip and the liquid crystal display device output a second control signal with a higher level value when the level of a backlight source is lower, so that the level of an