Abstract: The present invention relates to a charging circuit and method for generating a charging current supplied to an output terminal (15) to which a battery (40) to be charged is connected. The charging current is indirectly sensed to generate a sensing current having a predetermined relation to the charging current. This sensing current is then compared to a generated predetermined reference current, wherein the charging current is controlled in response to the result of the comparison. Thereby, accuracy, system costs and power efficiency can be increased as a low-ohmic precision resistor is no longer required in the charge current branch of the circuit. Furthermore, the proposed solution enables a simple implementation of the circuit as an integrated circuit.

Abstract: The present invention relates to a charging circuit and method for generating a charging current supplied to an output terminal (15) to which a battery (40) to be charged is connected. The charging current is indirectly sensed to generate a sensing current having a predetermined relation to the charging current. This sensing current is then compared to a generated predetermined reference current, wherein the charging current is controlled in response to the result of the comparison. Thereby, accuracy, system costs and power efficiency can be increased as a low-ohmic precision resistor is no longer required in the charge current branch of the circuit. Furthermore, the proposed solution enables a simple implementation of the circuit as an integrated circuit.

Abstract: A voltage regulator for converting an input voltage (Vi) into an output voltage (Vo). The input voltage may be burdened with a ripple. The output voltage (Vo) supplied by the voltage regulator is virtually free from ripple. The voltage regulator comprises an input terminal (1) for receiving the input voltage (Vi), an output terminal for supplying the output voltage (Vo) in response to the input voltage (Vi), and current limiting means for limiting the maximum absolute value of an output current (Io) taken from the output terminal (2). The current limiting means comprise a field effect transistor (TCL). The voltage regulator further comprises a first current mirror (CM1) comprising transistors (T11, T12), a second current mirror (CM2) comprising transistors (T13, T14), and a third current mirror comprising transistors (T15, T16). In a typical operation, the field effect transistor (TCL) is in the linear region and thus behaves like a resistance.

Abstract: A voltage regulator for converting an input voltage (Vi) into an output voltage (Vo). The input voltage may be burdened with a ripple. The output voltage (Vo) supplied by the voltage regulator is virtually free from ripple. The voltage regulator comprises an input terminal (1) for receiving the input voltage (Vi), an output terminal for supplying the output voltage (Vo) in response to the input voltage (Vi), and current limiting means for limiting the maximum absolute value of an output current (Io) taken from the output terminal (2). The current limiting means comprise a field effect transistor (TCL). The voltage regulator further comprises a first current mirror (CM1) comprising transistors (T11, T12), a second current mirror (CM2) comprising transistors (T13, T14), and a third current mirror comprising transistors (T15, T16). In a typical operation, the field effect transistor (TCL) is in the linear region and thus behaves like a resistance.