A power supply apparatus and an electronic apparatus are provided. The power supply apparatus includes: a plurality of power supplies arranged as a single array; a switch disposed between the plurality of power supplies configured to control connection states of the plurality of power supplies; and a controller configured to control the switch to connect the plurality of power supplies in parallel when a first event requiring a voltage less than a predetermined reference voltage occurs, and configured control the switch to connect the plurality of power supplies in series when a second event requiring a voltage exceeding the predetermined reference voltage occurs.