Power supply voltage stabilizing method, semiconductor device, and power supply system

A semiconductor device comprising:

• a pulse width modulator that outputs a pulse width signal in accordance with a difference between an output voltage and a target voltage;
• a current feedback controller that is coupled with the pulse width modulator;
• a voltage feedback controller that is coupled with the current feedback controller;
• and
• a parameter controller that is coupled with the current feedback,
• wherein the parameter controller includes a first table in which a plurality of first parameters are set,
• wherein the first table is configured using a plurality of registers in which the first parameters are set by a processor,
• wherein the characteristics of the current feedback controller are changed in accordance with the first parameters supplied from the parameter controller, respectively, and
• wherein in accordance with a battery detection signal on the basis of a battery voltage supplied to a switch controlled by the pulse width signal and a current detection signal on the basis of a current output through the switch, the parameter controller selects one of the first parameters to be supplied to the current feedback controller.