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 minimum of 2oz copper thickness is recommended, and the thermal pad should be connected to a ground plane to reduce thermal resistance.
To ensure stable operation with a high-ESR output capacitor, ROHM recommends adding a 1nF to 10nF ceramic capacitor in parallel with the output capacitor to reduce the overall ESR. Additionally, the output capacitor should be placed close to the IC to minimize parasitic inductance.
The maximum allowed voltage on the EN pin is 6V, which is higher than the recommended operating voltage of 5V. However, it's essential to ensure that the EN pin voltage does not exceed the maximum rating to prevent damage to the IC.
The BD37503FV-E2 is rated for operation up to 105°C, but ROHM recommends derating the output current and voltage to ensure reliable operation. A thermal design should be implemented to keep the junction temperature below 125°C to prevent damage to the IC.
To troubleshoot oscillation or instability issues, ROHM recommends checking the PCB layout for parasitic inductance and capacitance, ensuring that the input and output capacitors are properly selected, and verifying that the feedback loop is properly compensated. Additionally, the IC's operating frequency and output voltage should be checked to ensure they are within the recommended specifications.
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