A good PCB layout for the TPS389033DSER 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.
When choosing an output capacitor for the TPS389033DSER, consider the output voltage, output current, and ripple requirements. 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 good options due to their low ESR and high reliability.
The TPS389033DSER 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. Exceeding the maximum input voltage can cause damage to the device.
The TPS389033DSER has a built-in overcurrent protection feature that limits the output current to a maximum of 3.5A. To implement overcurrent protection, connect a sense resistor (Rs) between the output and the GND pin, and set the overcurrent threshold (Ilim) using the ILIM pin. The device will limit the output current to the set threshold during an overcurrent event.
The thermal derating curve for the TPS389033DSER is not explicitly stated in the datasheet, but it can be estimated based on the device's thermal resistance (RθJA) and the maximum junction temperature (Tj). As a general guideline, the device's output current should be derated by 1.5mA/°C above 25°C 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.
