A good PCB layout for the TPS3805H33DCKRG4 involves placing the device close to the power source, using a solid ground plane, and keeping the input and output capacitors close to the device. Additionally, it's recommended to use a separate analog and digital ground plane to minimize noise coupling.
The input capacitor should be a low-ESR ceramic capacitor with a value of 1-10uF, while the output capacitor should be a low-ESR ceramic capacitor with a value of 1-22uF. The capacitor values and types should be chosen based on the specific application requirements and the device's operating frequency.
The maximum ambient temperature range for the TPS3805H33DCKRG4 is -40°C to 125°C. However, the device's performance and reliability may be affected at extreme temperatures, so it's recommended to operate the device within a temperature range of -20°C to 85°C for optimal performance.
To ensure proper power-up and power-down of the TPS3805H33DCKRG4, it's recommended to follow a controlled power-up sequence, where the input voltage is ramped up slowly to the nominal voltage, and the device is enabled after the input voltage has reached the nominal value. During power-down, the input voltage should be ramped down slowly to prevent any voltage spikes or oscillations.
To ensure EMI and EMC compliance when using the TPS3805H33DCKRG4, it's recommended to use a shielded enclosure, keep the device and its associated components away from radiating sources, use a common-mode choke or ferrite bead to filter the input and output lines, and ensure proper grounding and shielding of the PCB.
TPS3805H33DCKRG4 datasheet
by Texas Instruments
