LT1181ACSW datasheet by Linear Technology

LT1181ACSW Frequently Asked Questions (FAQs)

• What is the maximum input voltage that can be applied to the LT1181ACSW?
  The maximum input voltage that can be applied to the LT1181ACSW is 15V, but it's recommended to keep it below 12V for optimal performance and to prevent damage to the device.
• How do I ensure the LT1181ACSW is stable and doesn't oscillate?
  To ensure stability, make sure to follow the recommended layout and component selection guidelines in the datasheet, including the use of a 10uF ceramic capacitor at the output and a 1uF ceramic capacitor at the input. Additionally, keep the input and output capacitors close to the device and use short, wide traces to minimize inductance.
• What is the minimum ESR (Equivalent Series Resistance) required for the output capacitor?
  The minimum ESR required for the output capacitor is 0.05 ohms. Using a capacitor with a lower ESR can cause instability and oscillation.
• Can I use the LT1181ACSW in a high-temperature environment?
  The LT1181ACSW 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 curves in the datasheet.
• How do I calculate the output voltage ripple of the LT1181ACSW?
  The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency. The datasheet provides a graph to estimate the output voltage ripple based on the output current and capacitance.