POWER SUPPLY DEVICE, ELECTRONIC DEVICE, AND A/D CONVERTER USED FOR THEM

摘要

There is provided a power supply device capable of appropriately setting a boost ratio of a charge pump circuit. A power supply device (100) converts an input voltage Vbat with a predetermined set voltage as a target value and outputs the converted voltage. In the power supply device (100), a boost ratio setting unit (30) for setting a boost ratio XCP of a charge pump circuit (10) according to the input voltage Vbat and a predetermined set voltage. A voltage adjustment unit (20) is a regulator circuit for adjusting the output voltage Vout of the charge pump circuit (10) so that it approaches the set voltage. An output voltage setting unit (40) generates a predetermined ste voltage as a digital value Dset. An A/D converter (32) converts the input voltage Vbat from analog to digital. The boost ratio setting unit (30) sets the boost ratio according to the comparison result between the input voltage Ddet converted from analog to digital and the set voltage Dset.