ROHM recommends a 2-layer or 4-layer PCB with a thermal relief pattern on the bottom layer to improve heat dissipation. A minimum of 1 oz copper thickness is recommended.
To ensure stable output voltage regulation, it is recommended to use a high-quality output capacitor with low ESR (Equivalent Series Resistance) and a minimum capacitance of 10uF. Additionally, the input capacitor should be placed as close to the IC as possible.
The BD90640EFJ-CE2 is rated for operation up to 105°C ambient temperature. However, for reliable operation, it is recommended to keep the ambient temperature below 85°C to ensure a junction temperature below 125°C.
While it is possible to use a different inductor value, it is not recommended as it may affect the stability and efficiency of the converter. The recommended inductor value is carefully selected to ensure optimal performance and should be used whenever possible.
To troubleshoot issues with the converter not starting up, check the input voltage, output voltage, and enable pin voltage. Ensure that the input voltage is within the recommended range, the output voltage is not overloaded, and the enable pin is properly biased. Also, check for any short circuits or open circuits on the PCB.
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