ROHM recommends a PCB layout with a thermal pad connected to a large copper area on the bottom layer, and multiple vias to dissipate heat efficiently. A minimum of 2oz copper thickness is recommended.
To ensure stable operation with a high-capacitance output capacitor, ROHM recommends adding a series resistor (Rs) between the output capacitor and the output pin to prevent oscillation. The value of Rs should be determined based on the output capacitor value and the desired stability margin.
The maximum allowed voltage on the EN pin is 6V, which is the absolute maximum rating. However, for normal operation, the recommended voltage range is 0V to 5.5V.
The BU4840F-TR 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 oscillation or instability issues, ROHM recommends checking the PCB layout for proper thermal design, ensuring the output capacitor is properly sized and placed, and verifying that the input voltage is within the recommended range. Additionally, check for any noise or ripple on the input voltage and ensure that the EN pin is properly driven.
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