A recommended PCB layout for optimal thermal performance would be to have a solid ground plane on the bottom layer, and to use thermal vias to connect the exposed pad to the ground plane. This helps to dissipate heat efficiently.
To ensure stability and prevent oscillations in the output voltage, it's essential to follow the recommended component values and PCB layout guidelines. Additionally, a minimum output capacitance of 10uF is recommended, and the output capacitor's ESR should be less than 1 ohm.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the device.
While the AP2142ASG-13 is rated for operation up to 125°C, it's essential to consider the device's power dissipation and thermal management in high-temperature environments. Ensure that the device is properly heatsinked, and the junction temperature is kept below 125°C.
To calculate the output voltage ripple and noise, consider the output capacitor's ESR, the switching frequency, and the inductor's value. A good starting point is to use the equations provided in the datasheet or to consult with a power management expert.
AP2142ASG-13 datasheet
by Diodes Incorporated
