| 摘要 |
A charge pump type voltage conversion circuit comprises a voltage detector which detects whether a boosted output voltage is larger or smaller than a predetermined reference voltage. A clock generator generates a clock signal based on the result of detection by the voltage detector. A charge pump circuit produces the boosted output voltage in response to the clock signal. A transfer control circuit allows or inhibits transfer of the clock signal to the charge pump circuit depending on the result of detection by the voltage detector. When the condition of the transfer control circuit is changed from the inhibited condition to the allowed condition based on the clock signal outputted from the clock generator, an operation of the charge pump circuit always starts from a voltage boost sequence, thereby reducing a ripple components of the boosted output voltage.
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