Power supply unit for aerosol generation device

A power supply unit for an aerosol generation device that generates an aerosol by heating an aerosol source, the power supply unit, comprising:

• a power supply;
• a connection receptacle electrically connectable to an external power supply;
• a first load;
• a charging integrated circuitry (IC) including an input terminal connected to the connection receptacle, a charging terminal connected to the power supply, and an output terminal connected to the first load, wherein the charging IC is configured to convert electric power input to the input terminal and output the converted electric power from the charging terminal;
• a discharge path configured to connect the power supply and a second load without passing through the charging IC, wherein
• the charging IC is configured to supply electric power input from the power supply to the charging terminal to the first load via the output terminal,
• the first load is a microcontroller configured to control heating the aerosol source by the second load and includes a single electric element, and
• the discharge path is configured to step up an output voltage of the power supply and apply the step-up output voltage to the second load,
• a power supply connector to which the power supply is connected;
• a first substrate;
• a second substrate different from the first substrate, wherein
• the charging IC is provided on the first substrate, and
• the discharge path and the third load are provided on the second substrate;
• and
• a third load connected to a node between the power supply and the second load in the discharge path and configured to operate by electric power supplied from the node.