BU7487FV-E2 - ROHM Semiconductor

BU7487FV-E2 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  ROHM recommends a thermal pad on the bottom of the package, connected to a large copper area on the PCB to dissipate heat efficiently. A minimum of 2oz copper thickness is recommended, and the thermal pad should be connected to a ground plane or a dedicated heat sink.
• How do I ensure stable operation with a high-capacitance output capacitor?
  To ensure stable operation with a high-capacitance output capacitor, ROHM recommends adding a series resistor (Rs) between the output capacitor and the output pin to prevent oscillation. The value of Rs should be chosen based on the output capacitor value and the desired stability margin.
• What is the maximum allowed voltage on the EN pin?
  The maximum allowed voltage on the EN pin is VCC + 0.3V. Exceeding this voltage may cause damage to the internal circuitry. It is recommended to use a voltage divider or a clamp circuit to limit the voltage on the EN pin.
• Can I use the BU7487FV-E2 in a high-temperature environment?
  The BU7487FV-E2 is rated for operation up to 105°C, but ROHM recommends derating the output current and voltage to ensure reliable operation at high temperatures. Consult the datasheet for derating curves and guidelines.
• How do I troubleshoot oscillation or instability issues with the BU7487FV-E2?
  To troubleshoot oscillation or instability issues, ROHM recommends checking the PCB layout for proper thermal design, ensuring the output capacitor is properly sized and placed, and verifying that the input voltage is within the recommended range. Additionally, checking the output voltage ripple and noise spectrum can help identify the root cause of the issue.