ROHM recommends a thermal pad size of at least 2.5mm x 2.5mm with multiple vias to the ground plane to ensure efficient heat dissipation. Additionally, keeping the PCB layer stack-up symmetrical and using a solid ground plane can help reduce thermal resistance.
To ensure stability, ROHM recommends adding a 1uF ceramic capacitor between the VIN and GND pins, and a 10uF electrolytic capacitor between the VOUT and GND pins. Additionally, keeping the input voltage ripple below 1% and using a low-ESR output capacitor can help prevent oscillation.
According to ROHM, the maximum allowed input voltage ripple for the RQ5C025TPTL is 1% of the input voltage. Exceeding this limit may affect the regulator's performance and stability.
While the RQ5C025TPTL has a maximum operating temperature of 125°C, ROHM recommends derating the output current and input voltage to ensure reliable operation in high-temperature environments. Consult the datasheet and ROHM's application notes for specific guidance.
To calculate power dissipation, use the formula Pd = (VIN - VOUT) x IOUT. To estimate the junction temperature, use the formula Tj = Ta + (Pd x Rthja), where Rthja is the junction-to-ambient thermal resistance. ROHM provides the Rthja value in the datasheet.
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