Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good thermal design practices, such as using a solid ground plane, minimizing thermal resistance, and keeping the device away from heat sources.
The output capacitor selection depends on the output voltage, current, and ripple requirements. TI recommends using a low-ESR capacitor with a minimum capacitance of 10uF and a voltage rating of at least 1.5 times the output voltage. Additionally, consider the capacitor's temperature rating and derating factors.
Although the datasheet specifies a maximum input voltage of 5.5V, it's essential to consider the voltage rating of the internal components and the device's operating conditions. As a general rule, it's recommended to keep the input voltage below 5V to ensure reliable operation and minimize the risk of damage.
The TPS40075RHLRG4 has a built-in overcurrent protection feature that limits the output current to a maximum of 4A. However, to implement additional overcurrent protection, you can use an external current sense resistor and a comparator to monitor the output current and shut down the device if the current exceeds a predetermined threshold.
TI recommends using a 10uF to 22uF ceramic or X5R/X7R capacitor with a voltage rating of at least 6.3V for the input capacitor. This helps to filter out noise and ensure stable operation. However, the optimal capacitor value and type may vary depending on the specific application and input voltage conditions.
TPS40075RHLRG4 datasheet
by Texas Instruments
