Richtek provides a recommended PCB layout in their application note AND9133, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
To ensure stable output voltage, it's essential to follow the recommended input capacitor selection, output capacitor selection, and feedback network design guidelines provided in the datasheet. Additionally, consider using a voltage supervisor or a power-on reset circuit to ensure the output voltage is stable during power-up and power-down sequences.
The maximum allowable ripple current for the input capacitor is not explicitly stated in the datasheet. However, as a general guideline, it's recommended to choose an input capacitor with a ripple current rating of at least 1A to ensure reliable operation. Consult the capacitor manufacturer's datasheet for specific ripple current ratings.
While ceramic capacitors can be used as output capacitors, they may not be the best choice due to their limited capacitance value and high equivalent series resistance (ESR). Richtek recommends using a low-ESR electrolytic capacitor or a polymer capacitor with a capacitance value of at least 10uF to ensure stable output voltage and minimize output voltage ripple.
To calculate the power dissipation of the RT9013-33GQW, use the following formula: Pd = (Vin - Vout) x Iout + (Vin x Iq), where Vin is the input voltage, Vout is the output voltage, Iout is the output current, and Iq is the quiescent current. Consult the datasheet for the quiescent current specification.
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