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 that the PCB layout is symmetrical to minimize electromagnetic interference (EMI).
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 the power loss. A larger sense resistor 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 EN is 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 that the EN pin is properly decoupled and filtered to prevent noise and glitches.
The BQ29728DSER has built-in OCP and SCP features. To handle OCP, set the OCP threshold using the OCSET pin, and the device will limit the current to the set value. For SCP, the device will automatically detect and respond to short-circuit conditions. Ensure that your design includes proper fault detection and response mechanisms to handle OCP and SCP events.
The BQ29728DSER has a maximum junction temperature (TJ) of 150°C. Ensure that your design provides adequate thermal dissipation, such as using a heat sink or thermal pad, to keep the device within the recommended operating temperature range. Also, follow good thermal design practices, such as keeping the device away from heat sources and using thermal vias to dissipate heat.
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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.
