Texas Instruments recommends a compact layout with the IC placed close to the battery, and the inductor and capacitor placed close to the IC. A 4-layer PCB is recommended, with the top layer for signals, the second layer for power, the third layer for ground, and the bottom layer for signals. A dedicated ground plane is also recommended.
The inductor selection depends on the input voltage, output voltage, and output current. A higher inductance value reduces the ripple current but increases the size. A good starting point is to use an inductor with an inductance value between 1-10uH, and a current rating of at least 1.5 times the maximum output current. TI also provides an inductor selection guide in the datasheet.
The BQ26231PW can handle an input voltage up to 28V, but it's recommended to keep the input voltage below 24V to ensure reliable operation and to prevent overheating.
The output voltage can be configured by selecting the appropriate resistor values for the feedback network. TI provides a resistor selection guide in the datasheet, and also offers an online calculator tool to simplify the process.
The typical efficiency of the BQ26231PW is around 90-95% for most operating conditions, depending on the input voltage, output voltage, and output current. However, the actual efficiency may vary depending on the specific application and layout.
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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.
