76 V input, 500 mA output — where this buck fits
The MAX5033DASA+T is a step-down (buck) switching regulator. It accepts 7.5 V to 76 V input and delivers an adjustable output at up to 500 mA.
At 125 kHz, the external inductor and output capacitor will be physically larger than what you'd use with a modern 500 kHz+ switcher. That's the trade-off for the wide input range and the simplicity of a fixed-frequency PWM controller. The 125 kHz rate also keeps switching losses low, which helps at light loads, but the inductor footprint is something to size early in the layout.
No synchronous rectifier — plan for the external diode
Because the MAX5033DASA+T does not integrate a synchronous rectifier, the design needs an external Schottky catch diode. That adds one component and some board area, but it also means the designer can pick a diode with the forward voltage and thermal performance that match the load. At 500 mA output, a 1 A rated Schottky with low Vf is the typical choice.
The part is ROHS3 compliant.