Texas Instruments provides a recommended PCB layout in the TPS73718 datasheet, which includes a thermal pad connected to a copper plane on the PCB to dissipate heat. Additionally, it's recommended to use a 4-layer PCB with a solid ground plane and to minimize the distance between the device and the output capacitors.
The output capacitors should be selected based on the output voltage, output current, and ripple requirements. A minimum capacitance of 10uF is recommended, with an ESR of less than 100mΩ. X5R or X7R ceramic capacitors are suitable for most applications. The datasheet provides a detailed guide for selecting output capacitors.
The TPS73718 has an absolute maximum input voltage rating of 17V. However, the recommended maximum input voltage is 15V to ensure reliable operation and to prevent damage to the device.
To ensure stability, it's essential to follow the recommended PCB layout, use the correct output capacitors, and ensure that the input capacitor is properly decoupled. Additionally, the datasheet provides a detailed guide for calculating the required output capacitor values and ESR to prevent oscillations.
The dropout voltage of the TPS73718 is typically around 300mV. This means that the input voltage must be at least 300mV higher than the output voltage to maintain regulation. For example, if the output voltage is 3.3V, the input voltage should be at least 3.6V to ensure proper regulation.
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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.
