LTC-4624JR - Lite-On

LTC-4624JR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  A 2-layer or 4-layer PCB with a solid ground plane and thermal vias under the IC is recommended. This helps to dissipate heat efficiently and reduce thermal resistance.
• How do I ensure reliable start-up and shutdown of the converter?
  Ensure that the input voltage rises and falls monotonically, and add a soft-start circuit to limit the inrush current during start-up. Also, add a voltage supervisor to ensure the converter shuts down cleanly during power-down.
• What is the maximum allowed capacitance for the output filter capacitor?
  The maximum allowed capacitance is dependent on the specific application and output voltage. As a general rule, keep the output capacitance below 10uF to avoid stability issues.
• How do I minimize electromagnetic interference (EMI) in my design?
  Use a shielded inductor, keep the switching node (SW) away from sensitive nodes, and add a common-mode choke to reduce EMI. Also, ensure good PCB layout practices, such as keeping the power stage away from the control circuitry.
• What is the recommended input capacitor type and value?
  Use a low-ESR ceramic capacitor (e.g., X5R or X7R) with a value between 4.7uF to 10uF, depending on the input voltage and ripple requirements.