The maximum input voltage is 40V, but it's recommended to keep it below 35V for reliable operation.
Use a high-quality output capacitor with low ESR, and ensure the input voltage is stable and within the recommended range. Also, use a suitable inductor with a high saturation current rating.
The minimum input voltage is 7V, but it's recommended to keep it above 8V for reliable operation.
The LM2591HVS-3.3/NOPB is rated for operation up to 125°C, but it's recommended to derate the output current and input voltage at high temperatures to ensure reliable operation.
The output current capability depends on the input voltage, output voltage, and inductor selection. Use the datasheet's equations and graphs to determine the maximum output current for your specific application.