The datasheet provides some general guidelines, but it's essential to follow a star-grounding configuration, keep the input and output traces separate, and place the device close to the bypass capacitors. Additionally, ensure that the PCB layout is symmetrical and balanced to reduce noise and electromagnetic interference (EMI).
The output capacitor value and type depend on the specific requirements of your application, such as output voltage, current, and ripple. A general rule of thumb is to use a low-ESR capacitor with a value between 10uF to 100uF. For high-current applications, use multiple capacitors in parallel to reduce the overall ESR. Consult the datasheet and application notes for more guidance.
The maximum input voltage rating is 15V, but the device can handle transient voltages up to 18V. However, operating the device at or near the maximum input voltage can affect the output voltage regulation, leading to reduced accuracy and stability. It's recommended to operate the device within the recommended input voltage range (2.5V to 12V) for optimal performance.
To ensure stability, follow the recommended component values and layout guidelines in the datasheet. Additionally, ensure that the output capacitor value and ESR are within the recommended range, and that the input and output traces are properly decoupled. If oscillations occur, try adding a small ceramic capacitor (10nF to 100nF) in parallel with the output capacitor to improve stability.
The typical dropout voltage of the LTC1326CMS8-2.5 is around 1.5V to 2V, depending on the output current and input voltage. This means that the output voltage will start to drop as the input voltage approaches the output voltage minus the dropout voltage. To maintain optimal output voltage regulation, ensure that the input voltage is at least 2.5V higher than the output voltage.
LTC1326CMS8-2.5 datasheet
by Linear Technology
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