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 4-layer PCB with a solid ground plane is also recommended.
ROHM recommends using a low-ESR output capacitor (less than 10 ohms) to ensure stable operation. If a high-ESR capacitor is used, a series resistor (around 1 ohm) can be added to improve stability.
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 the EN pin voltage does not exceed the input voltage (VIN) to prevent damage.
The BD3871FS-E2 is rated for operation up to 105°C, but the maximum junction temperature (TJ) should not exceed 125°C. Ensure proper thermal design and heat dissipation to prevent overheating.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
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BD3871FS-E2 Overview
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