L4971D datasheet by STMicroelectronics

L4971D Frequently Asked Questions (FAQs)

• What is the maximum input voltage that the L4971D can handle?
  The L4971D can handle input voltages up to 40V, but it's recommended to keep it below 35V for reliable operation.
• How do I choose the right output capacitor for the L4971D?
  The output capacitor should be chosen based on the output voltage and current requirements. A general rule of thumb is to use a capacitor with a value between 10uF to 100uF, and a voltage rating of at least 1.5 times the output voltage.
• What is the purpose of the bootstrap capacitor (CBOOT) in the L4971D?
  The bootstrap capacitor (CBOOT) is used to generate the high-side gate drive voltage for the internal power MOSFET. It should be a low-ESR ceramic capacitor with a value between 10nF to 100nF.
• How do I ensure the L4971D operates within its thermal limits?
  The L4971D has a thermal shutdown feature that turns off the device when it exceeds 150°C. To ensure operation within thermal limits, ensure good heat sinking, use a thermal pad or heat sink, and keep the device away from high-temperature sources.
• What is the minimum input voltage required for the L4971D to operate?
  The L4971D can operate with input voltages as low as 7V, but the output voltage regulation may not be guaranteed below 8V.