A good PCB layout for the AS2333S-13 should include a solid ground plane, wide power traces, and a thermal relief pattern under the IC to facilitate heat dissipation. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure proper power-up and configuration, follow the recommended power-up sequence: VCC, then EN, then VIN. Also, make sure to tie the EN pin high during normal operation and use an external resistor to set the output voltage.
When selecting the output capacitor, consider the output voltage, output current, and ripple requirements. A low-ESR capacitor with a minimum capacitance of 10uF is recommended. The capacitor should also be rated for the maximum output voltage and have a low equivalent series resistance (ESR) to minimize voltage ripple.
To minimize EMI, use a shielded inductor, keep the switching node (SW) away from sensitive nodes, and use a common-mode choke or ferrite bead on the input and output lines. Additionally, ensure good PCB layout practices, such as separating analog and digital grounds, and using a solid ground plane.
The AS2333S-13 has a thermal pad that must be connected to a solid ground plane or a thermal relief pattern on the PCB to facilitate heat dissipation. Ensure good airflow around the device, and consider using a heat sink or thermal interface material if the device will be operating at high temperatures or high currents.
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AS2333S-13 Overview
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