A good PCB layout for the LT1280ACN involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing trace lengths and widths to reduce parasitic inductance and capacitance. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure stability, make sure to follow the recommended component values and PCB layout guidelines. Additionally, ensure that the output capacitor has a low ESR (Equivalent Series Resistance) and is properly decoupled from the output voltage. A minimum output capacitance of 10uF is recommended.
The maximum input voltage that the LT1280ACN can handle is 15V, but it's recommended to operate the device within the specified input voltage range of 3.5V to 12V for optimal performance and reliability.
The LT1280ACN is rated for operation up to 125°C, but its performance and reliability may degrade at high temperatures. It's recommended to derate the device's output current and voltage according to the temperature derating curve provided in the datasheet.
The output voltage ripple of the LT1280ACN can be calculated using the formula: ΔVout = (Iout * ESR) / (f * Cout), where Iout is the output current, ESR is the equivalent series resistance of the output capacitor, f is the switching frequency, and Cout is the output capacitance.
LT1280ACN#PBF datasheet
by Linear Technology
