BQ4802LYPWR datasheet by Texas Instruments

BQ4802LYPWR Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance of the BQ4802LYPWR?
  A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the input and output capacitors close to the IC, and use short, wide traces for the power lines.
• How do I ensure the BQ4802LYPWR operates within its thermal limits?
  Use a thermal pad or a heat sink to dissipate heat. Ensure good airflow around the device, and avoid blocking the thermal pad. Monitor the junction temperature (TJ) and adjust the design accordingly.
• What is the recommended input capacitor value and type for the BQ4802LYPWR?
  A 10uF to 22uF X5R or X7R ceramic capacitor is recommended, placed as close to the VIN pin as possible. This helps to filter the input voltage and reduce noise.
• How do I optimize the output capacitor selection for the BQ4802LYPWR?
  Choose an output capacitor with low ESR (Equivalent Series Resistance) and a capacitance value between 10uF to 47uF. A 22uF X5R or X7R ceramic capacitor is a good starting point. Consider the output voltage ripple and transient response requirements.
• What is the recommended operating frequency range for the BQ4802LYPWR?
  The BQ4802LYPWR operates at a fixed frequency of 2.2 MHz. This frequency is optimized for efficiency and is not adjustable.