A good PCB layout for the SM15T18A should ensure good thermal conductivity. Place the device near a thermal pad or a heat sink, and use thermal vias to dissipate heat. Keep the PCB layer stack-up symmetrical to minimize thermal resistance.
Choose an input capacitor with a low ESR (Equivalent Series Resistance) and a high ripple current rating. A ceramic capacitor with an X7R or X5R dielectric is recommended. The capacitor value should be between 10uF to 22uF, depending on the input voltage and current requirements.
The maximum allowed voltage on the enable pin (EN) is 6V. Exceeding this voltage may damage the device. Ensure that the voltage on the EN pin does not exceed the recommended maximum voltage.
To ensure stability, follow the recommended PCB layout and component placement guidelines. Use a low-ESR output capacitor, and ensure the output voltage is within the recommended range. Avoid using a capacitor with a high ESL (Equivalent Series Inductance) on the output.
The maximum power dissipation of the SM15T18A depends on the ambient temperature and the thermal resistance of the PCB. Refer to the datasheet for the power dissipation curves and thermal resistance values. Ensure the device operates within the recommended temperature range.
SM15T18A datasheet
by STMicroelectronics
