A good PCB layout for the TPS2391DGK 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 common ground point for the input and output grounds to reduce noise and improve stability.
The input capacitor should be chosen based on the input voltage ripple requirement, 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 input voltage. X5R or X7R ceramic capacitors are good options due to their low ESR and high reliability.
The TPS2391DGK can deliver up to 1A of output current, but this is dependent on the input voltage, output voltage, and ambient temperature. It's recommended to check the device's thermal performance and power dissipation to ensure reliable operation.
The TPS2391DGK has a built-in overcurrent protection feature that limits the output current to a maximum of 2.5A. To implement overcurrent protection, connect a sense resistor (Rs) between the output and the GND pin, and set the overcurrent threshold voltage (Vocp) using an external resistor divider network.
The TPS2391DGK is rated for operation up to 125°C, but its performance and reliability may degrade at high temperatures. It's recommended to derate the device's output current and power dissipation at high temperatures to ensure reliable operation.
TPS2391DGK datasheet
by Texas Instruments
