The invention provides a digital power supply providing circuit and a liquid crystal driver. The digital power supply providing circuit comprises a control module; and the control module comprises an obtaining unit, a comparison unit, a step-down unit, wherein the obtaining unit obtains the change rate of the voltage of a digital power supply in the initial stage, the comparison unit compares the change rate with a preset threshold to obtain a comparison result, and generates a control signal according to the comparison result, and when the change rate exceeds the preset threshold, the step-down unit reduces the input voltage of the enablement end via the control signal so that the a power management module is in an OFF state. According to the digital power supply providing circuit and the liquid crystal driver, the control module is added to the output end of the present power management module, so that the voltage of the enablement end is reduced and the power management is in the OFF state when the change rate of the output voltage of the power management module is higher than the preset threshold, and a time sequence controller is prevented from damage.