Switch control device and battery pack including the same

A switch control device, comprising:

• a retention circuit configured to receive a control signal and a safety signal, and to operate in one of a transfer mode and a retention mode according to the safety signal;
• a retention control circuit configured to control the retention circuit to operate only in the transfer mode regardless of the safety signal if a disable signal is received;
• a first controller configured to output the control signal to control a switch and to output the disable signal according to an operation state of a device in which the switch control device is mounted;
• and
• a second controller configured to output the safety signal according to the operation state of the first controller,
• wherein the retention circuit is further configured to output a switch control signal having a level varying according to the control signal in the transfer mode, and to retain the switch control signal in a previous state for a predetermined time in the retention mode,
• wherein the retention control circuit allows the retention circuit to operate in the retention mode if a reset signal is received, and
• the first controller outputs the reset signal according to the operation state of the device, and
• wherein the retention circuit includes:
• a latch circuit operating in one of the transfer mode and the retention mode and outputting the switch control signal according to a logical product result of the control signal and the safety signal while operating in the transfer mode and retaining the switch control signal in a previous state while operating in the retention mode, and
• a timer circuit operating the latch circuit in the transfer mode if a predetermined time elapses after the latch circuit operates in the retention mode.