Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general best practices for power management ICs, such as keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing trace lengths and widths.
The TPS3809L30MDBVREP has a power-good output (PG) that indicates when the output voltage is within regulation. Wait for the PG signal to go high before enabling the load. Also, ensure that the input voltage is within the recommended range and that the device is properly bypassed with capacitors.
The maximum allowed voltage on the EN pin is 6V. To protect it from overvoltage, use a voltage divider or a zener diode to limit the voltage to within the recommended range. Additionally, ensure that the EN pin is not exposed to voltage transients or spikes.
The output voltage of the TPS3809L30MDBVREP is fixed at 3.0V. The tolerance is ±2% over the operating temperature range. To calculate the output voltage, use the formula: VOUT = 3.0V * (1 + (ΔVOUT / VOUT)), where ΔVOUT is the output voltage tolerance.
The thermal derating of the TPS3809L30MDBVREP is 12.5mW/°C. To calculate the maximum ambient temperature, use the formula: TAmax = TJmax - (PD / θJA), where TAmax is the maximum ambient temperature, TJmax is the maximum junction temperature (150°C), PD is the power dissipation, and θJA is the junction-to-ambient thermal resistance (45°C/W).
TPS3809L30MDBVREP datasheet
by Texas Instruments
