76V input, 1A output — a high-voltage buck for industrial rails
The Maxim MAX5035DASA+T is a step-down (buck) switching regulator delivering 1A from a wide input range of 7.5V to 76V. The adjustable output is set via external resistors from 1.25V up to 13.2V. Switching at 125kHz keeps the design simple — no high-frequency layout headaches — and the -40°C to 125°C junction temperature rating suits it for industrial motor drives, automotive body electronics, and telecom line cards where the input rail can swing from a regulated 12V bus up to an unregulated 48V or 72V supply.
No synchronous rectifier — external diode adds cost but simplifies
The MAX5035DASA+T uses an external Schottky catch diode rather than an integrated synchronous rectifier. That means one extra component on the BOM and a slight efficiency penalty at light loads, but it also eliminates the bootstrap capacitor and the risk of shoot-through. For a 1A rail in a 76V-capable part, the diode cost is modest and the reliability trade-off is well understood. The 125kHz switching frequency keeps switching losses low, so the external diode runs cool even at full load.
Package and footprint — 8-SOIC with standard pin spacing
Housed in an 8-SOIC package (0.154" body width, 3.90mm), the MAX5035DASA+T uses a standard surface-mount footprint. No exposed pad — thermal management relies on the copper area on the PCB and the airflow.
No NRND or EOL flags. The MAX5035DASA+T is a current-production part from Maxim (now Analog Devices), available through independent distribution.