76 V input, 1 A output — wide-bus buck for industrial rails
The MAX5035AASA+ is a fixed 3.3 V output step-down (buck) regulator from Analog Devices, delivering 1 A continuous from a 7.5 V to 76 V input bus. The 125 kHz switching frequency keeps the inductor small while staying below the AM broadcast band — useful in noise-sensitive industrial enclosures. The 76 V maximum input covers 24 V industrial rails with headroom for transients, as well as 48 V telecom buses and 12 V/24 V automotive systems — no external pre-regulator needed.
No synchronous rectifier — external diode impacts BOM and light-load efficiency
The MAX5035AASA+ does not integrate a synchronous rectifier. An external Schottky catch diode is required in the standard buck topology — add a 1 A, 100 V rated diode to the BOM. This increases the component count and board area but keeps the regulator cost lower than a synchronous alternative. At light loads, the diode's forward drop reduces efficiency compared to a synchronous FET — expect a few percent penalty below 100 mA output. For always-on or low-power standby rails, factor this into the thermal budget.
Availability and current pricing confirmed at RFQ time.