Storage device including auxiliary power supply device and operating method thereof

A storage device comprising:

• an auxiliary power supply device configured to provide an auxiliary power;
• a power controller configured to output an internal power, having a constant voltage level, based on one of external power or the auxiliary power, to monitor the auxiliary power supply device, and to generate a deterioration monitoring signal, indicating a degree of deterioration of the auxiliary power supply device, based on the monitoring of the auxiliary power supply device;
• an operating voltage provider configured to generate an output voltage having a plurality of voltage levels, based on the internal power;
• and
• a controller configured to receive the deterioration monitoring signal, to compare the degree of deterioration of the auxiliary power supply device with a reference value in response to the deterioration monitoring signal, and to generate a voltage scaling command for controlling the operating voltage provider to convert an average voltage level of the output voltage to a dynamic voltage scaling (DVS) level based on a result of the comparison.

A method of operating a storage device which comprises a power supply device including an auxiliary power supply device and a main system configured to operate based on an output voltage output from the power supply device, the method comprising:

• monitoring a degree of deterioration of the auxiliary power supply device;
• comparing the degree of deterioration of the auxiliary power supply device with a reference value;
• generating a voltage scaling command for converting an average voltage level of the output voltage into a dynamic voltage scaling (DVS) level when the degree of deterioration of the auxiliary power supply device is less than the reference value;
• and
• executing the voltage scaling command when a sudden power-off occurs.