Inrush current limiter and system including the same

An inrush current limiter comprising:

• a first input node and a second input node for receiving an input voltage from a power source;
• a first output node and a second output node for being connected with a load;
• an inrush-current-limiting portion comprising a transistor connected between the first input node and the first output node, and for turning on the transistor when a voltage level of the input voltage is higher than a first level, and for limiting an inrush current by controlling time until the transistor is turned on after application of the input voltage;
• a switch connected between a control terminal of the transistor and the second input node;
• and
• a mode controller configured to:
• turn on the switch when the voltage level of the input voltage is lower than a second level that is lower than the first level;
• and
• turn off the switch when a voltage level of the input voltage is higher than a first level,
• wherein, when the switch is off, the inrush-current-limiting portion is configured to control the transistor to turn on gradually to limit an inrush current, and
• wherein, when the switch is on and a voltage level of the input voltage is equal to or higher than the second level, the input voltage is applied between the second input node and the control terminal of the transistor to turn on the transistor.