A good PCB layout practice is to keep the input and output traces separate, use a solid ground plane, and place the device close to the input capacitors. Additionally, use a shielded inductor and keep the switching node (SW) away from sensitive nodes.
To ensure the device operates within the SOA, implement a soft-start circuit to limit the inrush current during startup, and use a voltage supervisor to monitor the input voltage and prevent the device from operating outside the recommended voltage range during shutdown.
A low-ESR ceramic capacitor (X5R or X7R dielectric) with a value of 4.7uF to 10uF is recommended for the input capacitor. This helps to filter the input voltage and reduce ripple.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
The NCV8402STT1G is rated for operation from -40°C to 150°C ambient temperature range. However, the device's performance and reliability may degrade at extreme temperatures, so it's essential to ensure proper thermal management and heat sinking.
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