A device for generating a pumping voltage and preventing an excessive increase in the pumping voltage includes a pumping voltage output unit that outputs a pumping voltage and adjusts the level of the pumping voltage in order to maintain a target voltage. The level of the pumping voltage is adjusted in response to a change in the level of the pumping unit. A release unit is included to detect an excessive pumping voltage. The release unit adjusts the level of the pumping voltage when the pumping voltage reaches a predetermined excessive level by compulsively decreasing the pumping voltage to prevent damage in the DRAM.