Patent ID: 9459641
Filing Date: 2016-10-04
CPC Classification: G05F,H02H,H02M

Claim Text:
1. A voltage regulator, comprising: an output transistor; a voltage dividing circuit for dividing an output voltage output from the output transistor to an output terminal, the voltage dividing circuit includes two or more switch circuits for switching in two or more resistors; an amplifier for comparing a divided voltage output from the voltage dividing circuit and a reference voltage so that the output voltage becomes constant; a drooping type overcurrent protection circuit; a fold-back type overcurrent protection circuit configured to lower an output current of the voltage regulator when the output voltage falls below a threshold voltage, wherein the fold-back type overcurrent protection circuit comprises: a trimming signal generation circuit configured to selectively output a trimming signal, responsive to an input signal, to simultaneously switch in one or more of the two or more switch circuits of the voltage divider circuit and one or more of the two or more switch circuits of the variable resistor circuitry of the fold-back type over current protection circuit to simultaneously increase the output voltage and the threshold voltage of the fold-back type overcurrent protection circuit or simultaneously decrease the output voltage and the threshold voltage of the fold-back type overcurrent protection circuit.