ROHM provides a recommended PCB layout in their application note AN191, 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. Refer to the application note AN191 for more details.
The maximum output current derating for high ambient temperatures can be found in the datasheet, but as a general guideline, the output current should be derated by 1.5mA/°C above 25°C. For example, if the maximum output current is 3A at 25°C, it would be derated to 2.55A at 50°C.
To ensure stability and prevent oscillations, follow the recommended PCB layout, use a suitable input capacitor, and ensure that the output capacitor meets the minimum ESR and capacitance requirements. Additionally, avoid using long, thin traces for the output voltage and current sense lines.
The recommended shutdown pin pull-up resistor value is typically in the range of 1kΩ to 10kΩ. A higher value can be used to reduce quiescent current, but may affect the shutdown response time.
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