LTC1877EMS8 datasheet by Linear Technology

LTC1877EMS8 Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the LTC1877EMS8 can handle?
  The maximum input voltage that the LTC1877EMS8 can handle is 36V, but it's recommended to keep it below 30V for reliable operation.
• How do I optimize the inductor selection for the LTC1877EMS8?
  To optimize the inductor selection, consider the inductor's saturation current, DC resistance, and core material. A good starting point is to choose an inductor with a saturation current rating of at least 1.5 times the maximum output current, and a DC resistance of less than 100mΩ.
• What is the recommended PCB layout for the LTC1877EMS8?
  For optimal performance, keep the input and output capacitors close to the IC, and use a solid ground plane to reduce noise. Keep the high-current paths (e.g., from the input capacitor to the IC) short and wide, and avoid routing sensitive signals near the inductor.
• How do I compensate for the output voltage ripple of the LTC1877EMS8?
  To minimize output voltage ripple, use a low-ESR output capacitor (e.g., ceramic or polymer) with a value of at least 10μF. You can also add a small RC filter (e.g., 1kΩ and 10nF) in parallel with the output capacitor to further reduce ripple.
• What is the thermal derating of the LTC1877EMS8?
  The LTC1877EMS8 has a thermal derating of 1.5°C/W, which means that for every 1°C increase in ambient temperature above 25°C, the maximum output current must be reduced by 1.5%.