A good PCB layout for the BQ24618RGER involves placing the device close to the battery, using a solid ground plane, and keeping the high-current paths short and wide. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane for the battery voltage.
The selection of external components depends on the specific application requirements. For the inductor, consider the maximum current rating, inductance value, and DC resistance. For capacitors, choose ones with a high capacitance value, low ESR, and a voltage rating that exceeds the maximum battery voltage. TI provides a component selection guide in the datasheet and application notes.
The BQ24618RGER is rated for operation from -40°C to 125°C. High temperatures can affect the device's performance, reducing its efficiency and increasing its power losses. Ensure proper thermal design and heat sinking to maintain a safe operating temperature.
The BQ24618RGER has a built-in overcurrent protection feature. Set the OCP threshold by selecting the appropriate resistor value for the ROC pin. The recommended OCP threshold is 1.5 to 2 times the maximum expected charging current. Adjust the OCP delay time by selecting the appropriate capacitor value for the COCP pin.
The recommended charge voltage limit is typically set to 4.2V per cell for Li-ion batteries. The charge current limit depends on the battery's capacity and the charging profile. A common setting is 0.5C to 1C (0.5 to 1 times the battery capacity) for standard charging, and up to 3C for fast charging.
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About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
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