A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the input and output traces short and away from each other to minimize noise and crosstalk.
Ensure the output capacitor is properly sized and placed close to the output pin. Also, use a low-ESR capacitor and a 1-2 ohm resistor in series with the output capacitor to prevent oscillations.
The maximum input voltage is 18V, but it's recommended to keep it below 15V to ensure reliable operation and prevent damage to the device.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * Rl) / (f * Cout), where Iout is the output current, Rl is the load resistance, f is the switching frequency, and Cout is the output capacitance.
The thermal derating curve can be found in the datasheet, but as a general guideline, the device can operate up to 125°C junction temperature. Derate the output current by 1.5mA/°C above 85°C.
SN105125DBVR datasheet
by Texas Instruments
