A good PCB layout for the TPS3898ADRYT involves placing the device close to the power source, using a solid ground plane, and keeping the input and output traces short and wide to minimize inductance and resistance. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
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. X5R or X7R ceramic capacitors are recommended due to their low ESR and high reliability.
The TPS3898ADRYT can handle input voltages up to 18V, but it's recommended to keep the input voltage below 15V to ensure reliable operation and to prevent overheating.
The output voltage of the TPS3898ADRYT can be adjusted by changing the resistor divider ratio between the FB pin and the output voltage. A higher resistor value will result in a higher output voltage, while a lower resistor value will result in a lower output voltage.
The thermal derating curve for the TPS3898ADRYT is not explicitly stated in the datasheet, but it can be estimated based on the device's power dissipation and thermal resistance. As a general rule, the device's output current should be derated by 1% for every 1°C increase in temperature above 25°C.
TPS3898ADRYT datasheet
by Texas Instruments
