Integrated circuit for stabilizing a voltage

摘要

An integrated circuit includes an input terminal (IN) for application of a supply voltage (Vext) and an output terminal (A) for generation of an output voltage (Vout). A first branch including a first controllable resistance (T 1 ) and a second branch including a charge pump ( 10 ) and a second controllable resistance (T 2 ) are connected between the input terminal (IN) and the output terminal (A). A control circuit ( 20 ) alters the resistance values of the first and second controllable resistances (T 1 , T 2 ) in a manner dependent on a ratio of an actual value (Vout) of the output voltage to a desired value (VSout) of the output voltage and a ratio of an actual value (Vext) of the supply voltage to a desired value (VSext) of the supply voltage. As a result, the output voltage (Vout) can be stabilized to the desired value (VSout) virtually independently of fluctuations of the supply voltage.