A good PCB layout for the LTC489IN involves keeping the input and output traces short and wide, using a solid ground plane, and placing 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.
To ensure stability, make sure to follow the recommended component values and layout guidelines in the datasheet. Additionally, check that the output capacitors are of sufficient size and have a low ESR, and that the input voltage is within the recommended range. If oscillations occur, try adding a small capacitor (e.g. 10nF) between the output and ground.
The maximum input voltage for the LTC489IN is 15V, but it's recommended to keep the input voltage below 12V to ensure reliable operation and minimize power dissipation.
The LTC489IN is rated for operation up to 125°C, but its performance and reliability may degrade at high temperatures. It's recommended to derate the output current and voltage according to the temperature derating curve in the datasheet.
The output voltage ripple of the LTC489IN can be calculated using the formula: ΔVout = (Iout * ESR) / (fsw * Cout), where Iout is the output current, ESR is the output capacitor's equivalent series resistance, fsw is the switching frequency, and Cout is the output capacitance.
LTC489IN#PBF datasheet
by Linear Technology
