Buck controller for 3V to 28V input rails
The MAX8576EUB+ from Analog Devices (formerly Maxim Integrated) is a single-output step-down (buck) switching regulator controller designed for positive-output, non-isolated DC-DC conversion. It accepts a wide supply range of 3V to 28V on Vcc (Vdd), making it suitable for systems powered from 5V, 12V, or 24V rails — common in industrial control, telecom, and battery-powered equipment. The controller drives an external transistor (Transistor Driver output type) and integrates synchronous rectification for improved efficiency. Its switching frequency is programmable from 200kHz to 500kHz, allowing the designer to trade off inductor size against switching losses.
The 3V to 28V supply range is the primary selection parameter: it determines which input bus the controller can regulate from. A 24V industrial supply rail sits comfortably within range, as does a 12V telecom bus or a 5V logic rail. The 200kHz to 500kHz switching frequency range gives flexibility — lower frequencies reduce switching losses but require larger magnetics; higher frequencies shrink the inductor and capacitor but increase gate-drive losses and may complicate EMI filtering. Control features include current limit and soft start, which protect the external MOSFET and the load during startup and fault conditions.
The part is ROHS3 compliant.