76V input buck for 12V/24V/48V industrial and automotive rails
The MAX5035BASA+T from Maxim Integrated is a step-down (buck) switching regulator that delivers a fixed 5V output at up to 1A from a wide input range of 7.5V to 76V. The 76V maximum input covers 12V, 24V, and 48V industrial buses with margin for transients, and it handles automotive load-dump conditions without external clamping. The 125kHz switching frequency is on the low side, which means the external inductor and output capacitor will be physically larger than a 500kHz+ design, but the switching losses stay low — a fair trade when the input rail is high and the ambient is hot.
Non-synchronous topology: budget a Schottky diode in the BOM
This is a non-synchronous rectifier design, so the buyer needs to add an external Schottky catch diode in the BOM. That diode carries the full 1A output current during the off-time, and its forward drop and thermal dissipation need to be accounted for in the layout. The part is rated for a junction temperature range of -40°C to 125°C, which qualifies it for under-hood automotive, outdoor telecom cabinets, and factory-floor motor-drive aux supplies where the ambient can hit 85°C or higher.
Active lifecycle and sourcing posture
The MAX5035BASA+T carries an active product status with ROHS3 compliance. For a BOM line that needs a high-voltage, low-frequency buck in an 8-SOIC footprint, this part is a stable, long-term selection.