BU7442NUX-TR - ROHM Semiconductor

BU7442NUX-TR 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 and a thermal relief pattern are also recommended.
• How do I ensure stable operation with a high-capacitance output capacitor?
  To ensure stable operation, ROHM recommends using an output capacitor with a low ESR (Equivalent Series Resistance) and a capacitance value between 10uF to 100uF. Additionally, a 1uF to 10uF ceramic capacitor in parallel with the output capacitor can help reduce noise and oscillation.
• What is the maximum allowed voltage on the EN pin?
  The maximum allowed voltage on the EN (Enable) pin is 6V, which is the absolute maximum rating. However, for normal operation, the recommended voltage range is 0V to 5.5V.
• Can I use the BU7442NUX-TR in a high-temperature environment?
  The BU7442NUX-TR is rated for operation up to 105°C, but derating is required for temperatures above 85°C. ROHM recommends consulting the thermal derating curve in the datasheet to ensure reliable operation in high-temperature environments.
• How do I calculate the power dissipation of the BU7442NUX-TR?
  Power dissipation can be calculated using the formula: Pd = (Vin - Vout) x Iout + (Vin x Iq), where Vin is the input voltage, Vout is the output voltage, Iout is the output current, and Iq is the quiescent current. ROHM provides a power dissipation calculation example in the datasheet.