Mobile device having an overcurrent cutoff function

An overcurrent control method for a mobile device having at least one function module, the method comprising:

• detecting whether a main power supply supplying power to the mobile device is cut off;
• converting potential levels of input/output signal lines of the function module to a predetermined potential level according to a result of the detection;
• and
• supplying a backup power to the mobile device.

A mobile device having an overcurrent cutoff function and at least one function module, the mobile device comprising:

• a main power supply unit which supplies power to the mobile device;
• a power supply load/unload detection unit which detects a separation of the main power supply unit from the mobile device;
• a control unit having application programs and an operating system which runs the application programs or controls the at least one function module;
• a memory device which stores temporary data during the execution of the application programs and data resulting resulting from the application program executions by the control unit;
• a power control unit which converts the power generated from the main power supply unit into a predetermined voltage and supplies the power to the control unit and the memory device;
• and
• a backup power supply unit which supplies a backup power to the mobile device when the power from the main power supply unit to the mobile device is detached.