LL4004G datasheet by Taiwan Semiconductor

LL4004G 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 is recommended. Ensure a minimum of 1 oz copper thickness and a thermal relief pattern under the IC.
• How do I ensure reliable operation at high temperatures?
  Implement a heat sink or thermal pad, and ensure good airflow. Monitor the junction temperature (Tj) and adjust the thermal design accordingly. The maximum Tj is 150°C.
• What is the recommended input capacitor value and type for the LL4004G?
  A 10uF to 22uF X5R or X7R ceramic capacitor is recommended for the input filter. The capacitor should be placed close to the IC and have a low ESR (Equivalent Series Resistance).
• How do I minimize electromagnetic interference (EMI) in my design?
  Use a shielded enclosure, keep the PCB layout compact, and use a common-mode choke or ferrite bead on the input lines. Ensure good grounding and decoupling, and consider adding EMI filters.
• What is the maximum output current capability of the LL4004G?
  The maximum output current is 4A, but it's recommended to derate the output current to 3.5A for reliable operation and to prevent overheating.