The maximum operating temperature range for the LTC489CSW is -40°C to 125°C, but it can be extended to 150°C with some derating.
To ensure proper biasing, make sure to connect the VCC pin to a stable 3.3V or 5V power supply, and the GND pin to a solid ground plane. Also, ensure that the input voltage to the VIN pin is within the recommended range of 2.7V to 5.5V.
For optimal performance, it is recommended to follow a star-grounding layout, keep the input and output traces short and separate, and use a solid ground plane to minimize noise and EMI. Additionally, place a 10uF ceramic capacitor between the VIN pin and GND pin to filter out high-frequency noise.
The LTC489CSW can be programmed for a specific output voltage by connecting the VOUT pin to a resistive divider network, which sets the output voltage based on the ratio of the resistors. The output voltage can be calculated using the formula: VOUT = 1.25V x (R1 + R2) / R2, where R1 and R2 are the resistors in the divider network.
The maximum output current capability of the LTC489CSW is 1A, but it can be limited by the thermal performance of the package and the PCB layout. It is recommended to derate the output current based on the ambient temperature and the thermal resistance of the package.
LTC489CSW datasheet
by Linear Technology
