Texas Instruments provides a recommended layout and placement guide in the datasheet, but it's essential to follow good PCB design practices, such as keeping the device close to the battery, using a solid ground plane, and minimizing trace lengths and widths to reduce ESR and ESL.
The sense resistor value depends on the battery chemistry, capacity, and charging current. A general rule of thumb is to choose a sense resistor value that results in a voltage drop of around 50-100 mV at the maximum charging current. TI provides a sense resistor calculation tool to help with this selection.
The EN (enable) pin is used to enable or disable the charging function. When EN is high, the charger is enabled, and when EN is low, the charger is disabled. This pin can be used to implement a power-saving feature or to control the charging function through a microcontroller or other logic circuit.
The BQ2057WTSTRG4 has a built-in pre-charge function that can be enabled by connecting a resistor between the PRECHG pin and the VCC pin. The pre-charge function slowly charges the battery to a safe voltage before switching to fast charging. The pre-charge resistor value depends on the battery chemistry and capacity.
The BQ2057WTSTRG4 has a thermal shutdown feature that protects the device from overheating. However, it's essential to ensure good thermal design practices, such as providing adequate heat sinking, using a thermally conductive PCB material, and keeping the device away from heat sources.
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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.
