Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general guidelines for high-frequency PCB design, such as keeping the power traces short and wide, using a solid ground plane, and minimizing vias and thermal reliefs.
The output capacitor should be chosen based on the desired output voltage ripple, output current, and operating frequency. A general rule of thumb is to use a capacitor with a capacitance value of at least 10uF and a voltage rating of at least 1.5 times the output voltage. Additionally, the capacitor's ESR (Equivalent Series Resistance) should be low enough to minimize voltage ripple.
The TPS3619-50DGK has an absolute maximum input voltage rating of 18V, but it's recommended to operate the device within the recommended input voltage range of 4.5V to 15V to ensure reliable operation and minimize the risk of damage.
The TPS3619-50DGK has a built-in overcurrent protection feature that can be enabled by connecting a resistor between the OCSET pin and the output voltage. The value of the resistor determines the overcurrent threshold, and the device will shut down if the output current exceeds this threshold.
The thermal derating curve for the TPS3619-50DGK is not explicitly provided in the datasheet, but it can be estimated based on the device's thermal resistance and maximum junction temperature. As a general rule, the device's output current should be derated by 1-2% per degree Celsius above 25°C to ensure reliable operation.
TPS3619-50DGK datasheet
by Texas Instruments
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