The maximum operating temperature range for the LTC1726EMS8-5#PBF is -40°C to 125°C.
To ensure proper power-up and initialization, follow the recommended power-up sequence: VCC, then VREF, and finally VIN. Also, ensure that the input voltage is within the recommended range and that the device is properly decoupled.
For optimal performance, follow a star-grounding scheme, keep analog and digital grounds separate, and use a solid ground plane. Route sensitive analog signals away from digital signals and keep the layout as symmetrical as possible.
To minimize noise sensitivity, use a low-noise power supply, add decoupling capacitors close to the device, and use a shielded enclosure. Also, avoid running digital signals near analog signals and use a ground plane to reduce electromagnetic interference.
For thermal management, use a heat sink or thermal pad on the exposed pad of the QFN package. Ensure good airflow around the device and avoid blocking airflow with nearby components.