The maximum input voltage that the LTC1877 can handle is 36V, but it's recommended to keep it below 30V for reliable operation.
To ensure the stability of the output voltage, make sure to use a minimum output capacitance of 10uF, and a maximum ESR of 1 ohm. Also, use a low-ESR capacitor for the input capacitor.
The maximum output current that the LTC1877 can deliver is 7A, but it's recommended to keep it below 5A for reliable operation.
The output voltage can be adjusted by using a resistive divider network between the output and the feedback pin. The ratio of the resistors determines the output voltage.
The EN (enable) pin is used to turn the regulator on or off. When the EN pin is high, the regulator is enabled, and when it's low, the regulator is disabled.