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 or a dedicated heat sink.
To ensure stable operation with a high-capacitance output capacitor, ROHM recommends adding a 1-10nF ceramic capacitor in parallel with the output capacitor to reduce the output impedance and prevent oscillation.
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 0-5.5V, with a logic high threshold of 2.4V and a logic low threshold of 0.8V.
The BD46405G-TR is rated for operation up to 125°C, but the maximum junction temperature (Tj) should not exceed 150°C. ROHM recommends derating the output current and voltage according to the temperature derating curve in the datasheet to ensure reliable operation.
The power dissipation of the BD46405G-TR can be calculated using the formula: Pd = (Vin - Vout) x Iout + (Vin x Iq), where Vin is the input voltage, Vout is the output voltage, Iout is the output current, and Iq is the quiescent current. ROHM recommends using the typical values from the datasheet for Vin, Vout, Iout, and Iq.
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