ROHM provides a recommended PCB layout in the datasheet, which includes a thermal pad and vias for heat dissipation. It's essential to follow this layout to ensure optimal thermal performance.
The LTR18EZPFSR056 has a built-in thermal shutdown feature that turns off the output when the junction temperature exceeds 150°C. To handle this, ensure proper heat sinking, and consider adding a thermal monitoring circuit to detect and respond to thermal shutdown events.
The datasheet recommends a 10uF ceramic capacitor with an X7R or X5R dielectric for the input capacitor. This value and type provide a good balance between noise filtering and stability.
To ensure stability, follow the recommended PCB layout, use the suggested input and output capacitors, and avoid long output traces. Additionally, consider adding a small resistor (e.g., 10Ω) in series with the output capacitor to prevent oscillations.
The output current derating for high temperatures is not explicitly stated in the datasheet. However, as a general rule, it's recommended to derate the output current by 1-2% per degree Celsius above 25°C to ensure reliable operation.
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