Patent ID: 8604869
Filing Date: 2013-12-10
Classification: G05F,H02M

Abstract:
1. A voltage generator that is driven by an input supply voltage, comprising: a pump controller, the pump controller generates a primary control and an auxiliary control according to level of the input supply voltage; a primary charge pump, coupled to the pump controller, the primary charge pump being controlled by the primary control to generate charge pump output voltage and drive a load; and an auxiliary charge pump, coupled to the pump controller and the primary charge pump, the auxiliary charge pump being controlled by the auxiliary control to generate an intermediate voltage, wherein after determining that the input supply voltage is lower than a reference voltage generated in the pump controller, the auxiliary charge pump generates the intermediate voltage with a voltage level higher than the input supply voltage, resulting in an increase in the primary charge pump output voltage, and wherein the pump controller further comprises a reference generator, that is coupled to the auxiliary charge pump, the reference generator being driven by the intermediate voltage and generating the reference voltage.