Texas Instruments recommends a compact layout with the IC placed close to the battery, and the power paths (VCC, GND, and BAT) should be as short as possible to minimize parasitic inductance and resistance. Additionally, a solid ground plane is recommended to reduce noise and improve thermal performance.
The RSET and RPROG resistors determine the charging voltage and current limits. TI provides a resistor selection guide in the datasheet, but a general rule of thumb is to choose RSET = 10 kΩ to 20 kΩ and RPROG = 1 kΩ to 5 kΩ. The exact values depend on the specific battery chemistry and charging requirements.
The EN (Enable) pin is an active-high input that enables or disables the charger. When EN is high, the charger is enabled, and when EN is low, the charger is disabled. This pin can be used to implement power management or to shut down the charger during shipping or storage.
The BQ25308RTER has a built-in battery detection circuit that detects the presence or absence of a battery. When a battery is inserted, the charger automatically starts charging. When the battery is removed, the charger enters a low-power sleep mode to minimize power consumption.
The BQ25308RTER can deliver up to 2.5 A of charging current, depending on the input voltage and the RPROG resistor value. However, the maximum charging current should be limited to the maximum rating of the battery and the system's power delivery capabilities.
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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.
