Richtek provides a recommended PCB layout in their application note ANI43, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
Richtek recommends using a low-ESR output capacitor with a value between 10uF to 22uF, and a voltage rating of at least 1.5 times the output voltage. The output capacitor should be placed close to the IC to minimize parasitic inductance and resistance.
According to Richtek's application note ANI43, the maximum allowed input voltage ripple is 1% of the input voltage, or 100mV, whichever is smaller. Exceeding this limit may affect the regulator's stability and performance.
Richtek recommends using a soft-start circuit to control the power-up sequence, and a power-good signal to monitor the output voltage. The EN pin should be driven high to enable the regulator, and low to disable it. A proper power-down sequence should be implemented to prevent damage to the IC and external components.
Richtek recommends using a high-quality, low-ESR input capacitor with a value between 1uF to 10uF, and a voltage rating of at least 1.5 times the input voltage. A ceramic or film capacitor is recommended, as they have lower ESR and ESL compared to electrolytic capacitors.
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