A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the input and output capacitors close to the IC, and use short, wide traces for the power lines.
Ensure that the output capacitor has a low ESR, and the input capacitor has a high capacitance. Also, add a small resistor (e.g., 1 ohm) in series with the output capacitor to dampen oscillations.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent overheating.
The output voltage ripple can be estimated using the formula: ΔVout = (Iout * ESR) / (f * Cout), where Iout is the output current, ESR is the output capacitor's equivalent series resistance, f is the switching frequency, and Cout is the output capacitance.
A 10uF to 22uF ceramic or film capacitor with a voltage rating of at least 25V is recommended. The capacitor should be placed close to the IC's input pins.
UC1637L883B datasheet
by Texas Instruments
