Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general high-frequency PCB design guidelines, such as keeping the input and output traces short and away from noise sources, and using a solid ground plane to reduce EMI.
To ensure stability, follow the datasheet's guidelines for output capacitor selection, and make sure the output capacitor is placed close to the device. Also, ensure that the input voltage is within the recommended range, and the device is operated within its specified temperature range.
The maximum input voltage is 42V, but it's recommended to operate the device within the recommended input voltage range of 3.5V to 36V to ensure reliable operation and to prevent damage to the device.
The LM27341QMY/NOPB is rated for operation up to 125°C, but it's recommended to derate the output current and input voltage as the temperature increases to ensure reliable operation. Consult the datasheet for more information on thermal derating.
Use an oscilloscope to measure the input and output voltages, and check for any signs of oscillation or ringing. Also, verify that the input voltage is within the recommended range, and the output capacitor is properly selected and placed. Consult the datasheet and application notes for more troubleshooting tips.