FDSM Power Modules Würth Elektronik MagI³C FDSM Fixed Step-Down Regulator Modules integrate the switching power stage, control circuitry, and inductor all in one package. Input and output capacitors are integrated so there is no need for external components for the module to operate. These FDSM modules provide peak efficiency up to 95% and a fixed output voltage of 3.3V or 5V. Ideal applications for Würth MagI³C FDSM Fixed Step-Down Regulator Modules include point-of-load, replacements for linear regulators, interface and microcontroller supplies, as well as general purpose.