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 for the thermal pad.
To ensure stable operation with a high-ESR output capacitor, add a 1-10nF ceramic capacitor in parallel with the output capacitor to reduce the overall ESR. Additionally, consider using a low-ESR output capacitor or a capacitor with a built-in ESR reduction feature.
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 device.
While the BD4269UEFJ-CE2 is rated for operation up to 105°C, it's essential to consider the derating of the device's performance and reliability at high temperatures. Consult ROHM's application notes and thermal design guidelines for high-temperature applications.
To troubleshoot oscillations or instability issues, check the PCB layout for noise coupling, ensure proper decoupling of the input and output capacitors, and verify that the output capacitor meets the recommended specifications. Also, consider adding a small series resistor (e.g., 1-10Ω) between the output capacitor and the load to improve stability.
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BD4269UEFJ-CE2 Overview
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