ROHM recommends a thermal pad on the bottom of the package, connected to a large copper area on the PCB to dissipate heat efficiently. A 4-layer PCB with a thermal via is also recommended.
To ensure stable operation, ROHM recommends using an output capacitor with a low ESR (Equivalent Series Resistance) and a capacitance value between 10uF to 100uF. Additionally, a 1uF to 10uF ceramic capacitor in parallel with the output capacitor can help to reduce noise and improve stability.
The maximum allowed voltage on the EN (Enable) pin is 6V, which is higher than the recommended operating voltage of 5V. However, it's recommended to keep the EN pin voltage within the recommended operating range to ensure reliable operation.
The BU7487SFV-E2 is rated for operation up to 105°C, but ROHM recommends derating the output current and voltage to ensure reliable operation at high temperatures. Consult the datasheet for derating curves and guidelines.
To troubleshoot oscillations or instability issues, check the PCB layout for proper thermal design, ensure the output capacitor is properly selected, and verify that the input voltage is within the recommended range. Also, check for any noise or ripple on the input voltage and ensure that the EN pin is properly driven.
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BU7487SFV-E2 Overview
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