Steps up the input voltage to a higher output level.
The primary function of an SMPS is to transfer power from a source (AC or DC) to a load while regulating voltage and current. The process generally follows these steps: Switch-Mode Power Supplies
Efficiently steps down voltage to a lower level. Steps up the input voltage to a higher output level
Different circuit configurations, or topologies, are used based on the desired output: Switch-Mode Power Supplies
Typically power MOSFETs or BJTs that perform the rapid switching.
Often a PWM controller like the TI TL598 that manages the switching cycles.