Patent ID: 9007121
Filing Date: 2015-04-14
Classification: G05F,H02M

Abstract:
1. A charge pump device, comprising: a driving stage, for generating a driving signal corresponding to a driving capability; a charge pump circuit, for generating an output voltage according to the driving signal; a comparing circuit, comprising a first comparator for comparing the output voltage and a first reference voltage to generate a first comparing result; an overload detection circuit, for generating a detection result according to at least one of the first comparing result and the output voltage; and a driving capability control circuit, coupled between the overload detection circuit and the driving stage for controlling the driving capability corresponding to the driving signal according to the detection result; wherein the detection result indicates whether the output voltage reaches a target voltage and whether the output voltage maintains at the target voltage, and the driving capability control circuit increases the driving capability to a specific driving capability when the detection result indicates that the output voltage does not maintain at the target voltage; wherein the driving capability control circuit decreases the driving capability after the driving capability control circuit sets the driving capability to the specific driving capability such that the output voltage reaches the target voltage, and a magnitude of the decreased driving capability is determined according to the number of previous times the output voltage has not maintained at the target voltage.