Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general guidelines for high-frequency PCB design, such as using a solid ground plane, minimizing trace lengths, and using bypass capacitors to reduce noise and ringing.
The output capacitor should be chosen based on the desired output voltage ripple, output current, and stability requirements. A general rule of thumb is to use a capacitor with a value between 10uF to 22uF, and a voltage rating of at least 2x the output voltage. Additionally, the capacitor's ESR (Equivalent Series Resistance) should be low enough to ensure stability.
The TPS3702AX18DDCR 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 16.5V to ensure optimal performance and reliability.
The TPS3702AX18DDCR has a built-in OVP feature that can be enabled by connecting the OVP pin to a voltage divider network that sets the OVP threshold. The OVP threshold should be set to a voltage slightly higher than the maximum desired output voltage to ensure that the device shuts down in case of an overvoltage condition.
The thermal derating curve for the TPS3702AX18DDCR is not explicitly provided 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 1-2% per degree Celsius above the maximum operating temperature to ensure reliable operation.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
