Richtek provides a recommended PCB layout in their application note ANI-23, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
To optimize output voltage accuracy and stability, ensure that the input voltage is within the recommended range, use a high-quality output capacitor with low ESR, and minimize the noise on the FB pin by using a low-pass filter or a noise-reducing capacitor.
Although not explicitly stated in the datasheet, Richtek recommends keeping the input voltage ripple below 1% of the input voltage to ensure reliable operation and prevent oscillations or instability.
While ceramic capacitors can be used, they may not be the best choice due to their high ESR and potential for resonance. Richtek recommends using a low-ESR electrolytic capacitor or a polymer capacitor for the output capacitor to ensure stability and optimal performance.
During startup or fault conditions, the thermal shutdown feature may be triggered. To handle this, ensure that the input voltage is within the recommended range, and consider adding a soft-start circuit or a voltage supervisor to prevent the device from entering thermal shutdown mode unnecessarily.
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