Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good design practices, such as keeping the high-current paths short and wide, using a solid ground plane, and placing the device near the battery. Additionally, ensure the PCB is designed to handle high currents and has adequate thermal dissipation.
The sense resistor value depends on the desired current sense accuracy and the maximum expected current. A smaller sense resistor value provides better accuracy but increases power loss. A larger value reduces power loss but decreases accuracy. TI recommends using a sense resistor value between 1 mΩ and 10 mΩ. Consult the datasheet for a detailed calculation formula.
The EN (Enable) pin is used to enable or disable the device. When EN is high, the device is enabled, and when it's low, the device is disabled. This pin can be used to implement a low-power shutdown mode or to control the device's operation based on system requirements. Ensure the EN pin is properly biased and decoupled to prevent unwanted device behavior.
The BQ29718DSER has built-in OCP and SCP features. To handle these events, connect the OCP and SCP pins to a microcontroller or a dedicated fault handler. When an overcurrent or short-circuit event occurs, the device will assert the corresponding pin, allowing the system to take corrective action, such as shutting down the device or alerting the user.
The BQ29718DSER has a maximum junction temperature (TJ) of 150°C. Ensure the device is mounted on a PCB with adequate thermal dissipation, such as a heat sink or thermal vias. Keep the device away from heat sources, and avoid high ambient temperatures. Monitor the device's temperature and adjust the system design accordingly to prevent overheating.
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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.
