A good PCB layout for the TPS610985DSER involves placing the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the input and output traces. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure stability, it's essential to follow the recommended component values and PCB layout guidelines. Additionally, ensure that the output capacitor has a low ESR and is placed close to the device. You can also add a small ceramic capacitor (e.g., 10nF) in parallel with the output capacitor to improve stability.
Although the datasheet specifies a maximum input voltage of 5.5V, it's recommended to limit the input voltage to 5V to ensure reliable operation and prevent damage to the device.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet. The output voltage ripple is primarily dependent on the output capacitor value, ESR, and the switching frequency. You can use the following equation: ΔVout = (Iout * ESR) / (2 * Cout * fsw), where Iout is the output current, ESR is the output capacitor ESR, Cout is the output capacitor value, and fsw is the switching frequency.
A ceramic input capacitor with a value of 4.7μF to 10μF is recommended. The capacitor should have a voltage rating of at least 6.3V and a low ESR (e.g., X5R or X7R dielectric).
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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.
