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 equivalent series resistance (ESR) and prevent oscillation.
The maximum allowed voltage on the EN (enable) 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 input voltage (VIN) to prevent damage to the device.
The BD45285G-TR is rated for operation up to 105°C, but ROHM recommends derating the output current and power dissipation to ensure reliable operation at high temperatures. Consult the datasheet for specific derating guidelines.
To calculate the power dissipation, use the formula: Pd = (VIN x IIN) + (VOUT x IOUT) + (VIN x IQ), where Pd is the power dissipation, VIN is the input voltage, IIN is the input current, VOUT is the output voltage, IOUT is the output current, and IQ is the quiescent current.
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