BAR43S datasheet by STMicroelectronics

BAR43S Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  STMicroelectronics provides a recommended PCB layout in the BAR43S application note (AN5323) and evaluation board documentation. It's essential to follow these guidelines to minimize noise, ensure proper thermal management, and optimize performance.
• How do I choose the correct output capacitor value?
  The output capacitor value depends on the specific application, output voltage, and desired ripple voltage. A general guideline is to use a capacitor with a value between 10uF to 22uF, with a voltage rating of at least 2x the output voltage. Consult the datasheet and application notes for more detailed guidance.
• What is the maximum input voltage that the BAR43S can handle?
  The BAR43S has an absolute maximum input voltage rating of 30V. However, the recommended operating input voltage range is 4.5V to 28V. Exceeding the maximum rating can damage the device.
• How do I ensure the BAR43S is stable and doesn't oscillate?
  To ensure stability, follow the recommended PCB layout, use a suitable output capacitor, and add a compensation capacitor (Ccomp) between the COMP pin and GND. The value of Ccomp depends on the output voltage and load current; consult the datasheet and application notes for guidance.
• What is the minimum input voltage required for the BAR43S to start up?
  The BAR43S has a minimum startup voltage of 2.5V. However, the device may not regulate properly below 3.5V. Ensure the input voltage is above 3.5V for reliable operation.