Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general guidelines for high-frequency PCB design, such as using a solid ground plane, minimizing trace lengths, and using vias to connect the ground plane to the thermal pad.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. A general rule of thumb is to choose a capacitor with a capacitance value of at least 10uF and a voltage rating of at least 1.5 times the output voltage. Additionally, consider the ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance) of the capacitor to ensure it can handle the high-frequency switching of the regulator.
The maximum input voltage rating for the TPS3779CQDBVRQ1 is 5.5V, but it's recommended to operate the device within the recommended input voltage range of 2.7V to 5.5V to ensure optimal performance and reliability.
To ensure stability, follow the recommended component values and PCB layout guidelines in the datasheet. Additionally, make sure to decouple the input and output pins with suitable capacitors, and use a low-ESR output capacitor. If oscillations occur, try adding a small ceramic capacitor (e.g., 10nF) between the VOUT and GND pins to improve stability.
The thermal derating for the TPS3779CQDBVRQ1 is specified in the datasheet. To calculate the maximum ambient temperature, use the formula: T_A = T_J - (P_D x θ_JA), where T_A is the ambient temperature, T_J is the junction temperature (150°C for this device), P_D is the power dissipation, and θ_JA is the junction-to-ambient thermal resistance (45°C/W for this device).
TPS3779CQDBVRQ1 datasheet
by Texas Instruments
