Texas Instruments recommends a 2-layer PCB with a solid ground plane on the bottom layer and a thermal relief pattern on the top layer to minimize thermal resistance. Additionally, placing the device near a thermal pad or heat sink can improve thermal performance.
To ensure reliable start-up and operation, it's recommended to add a soft-start circuit to limit the inrush current and prevent voltage drops. Additionally, using a high-quality input capacitor with low ESR and a sufficient voltage rating can help to filter out noise and ensure stable operation.
The maximum output current capability of the LM3754SQX/NOPB is 4A, but it's recommended to derate the output current based on the ambient temperature and the thermal performance of the PCB to ensure reliable operation.
To protect the device from overvoltage and undervoltage conditions, it's recommended to add overvoltage protection (OVP) and undervoltage protection (UVP) circuits. OVP can be implemented using a zener diode and a resistor, while UVP can be implemented using a voltage supervisor IC.
The recommended input capacitor value is 10uF to 22uF, and it's recommended to use a low-ESR ceramic capacitor or a film capacitor with a high ripple current rating to minimize voltage drops and ensure stable operation.
LM3754SQX/NOPB datasheet
by Texas Instruments
