Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general guidelines for switching regulator layout, such as keeping the input and output capacitors close to the IC, and using a solid ground plane to reduce noise and EMI.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency. The datasheet provides a graph to estimate the output voltage ripple based on the output capacitance and switching frequency.
The maximum input voltage rating of the TPS75003RHLRG4 is 15V, but it's recommended to operate the device within the recommended input voltage range of 7V to 14V to ensure optimal performance and reliability.
The output capacitor should be selected based on the output voltage, output current, and switching frequency. A general rule of thumb is to use a capacitor with a capacitance value of at least 10uF to 22uF, and a voltage rating of at least 1.5 times the output voltage. The datasheet provides a list of recommended output capacitors.
The thermal derating of the TPS75003RHLRG4 is 1.5°C/W, which means that the device can dissipate up to 1.5W of power per degree Celsius of temperature rise above the ambient temperature. The datasheet provides a thermal derating curve to estimate the maximum power dissipation based on the ambient temperature.
TPS75003RHLRG4 datasheet
by Texas Instruments
