A good PCB layout practice for FMBA14 is to keep the input and output traces as short as possible, use a solid ground plane, and keep the switching node (SW pin) away from sensitive analog circuits. Additionally, use a shielded inductor and orient it to minimize radiation.
When selecting an inductor for FMBA14, consider the inductor's saturation current, DC resistance, and self-resonant frequency. A good starting point is to choose an inductor with a saturation current rating above the peak current of the FMBA14 and a DC resistance less than 0.1 ohms. Also, ensure the inductor's self-resonant frequency is above the switching frequency of the FMBA14.
The maximum ambient temperature for FMBA14 is 85°C, but it's recommended to derate the device's power dissipation above 70°C to ensure reliable operation.
The output voltage ripple of FMBA14 can be calculated using the formula: ΔVout = (IL * ESL) / (Cout * fsw), where IL is the output current, ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
A low-ESR, high-frequency ceramic capacitor (e.g., X7R or X5R) is recommended for the input capacitor of FMBA14. This type of capacitor can handle the high-frequency switching currents and minimize voltage ripple.
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