ROHM provides a recommended PCB layout in their application note AN11984, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor selection depends on the input voltage, output current, and ripple current requirements. ROHM recommends using a low-ESR capacitor with a minimum capacitance of 10uF and a voltage rating of at least 1.5 times the input voltage. The capacitor should also be able to handle the maximum ripple current specified in the datasheet.
The maximum output current derating for high ambient temperatures can be found in the thermal derating curve provided in the datasheet. For example, at 85°C ambient temperature, the maximum output current is derated to 70% of the maximum rating at 25°C ambient temperature.
To ensure stability and prevent oscillations, ROHM recommends following the guidelines for output capacitor selection, input capacitor selection, and PCB layout. Additionally, the output voltage should be decoupled with a capacitor of at least 1uF, and the input voltage should be filtered with a capacitor of at least 10uF.
To prevent damage to the regulator, ROHM recommends shutting down the input voltage before shutting down the enable pin. This ensures that the internal circuitry is properly discharged and prevents damage from backflow current.
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