A good PCB layout for the BQ24702PW involves keeping the high-current paths short and wide, using multiple vias to connect the GND pins to the thermal pad, and placing the input capacitors close to the VIN pin. A 4-layer PCB with a solid ground plane is recommended.
To select the right inductor for the BQ24702PW, consider the maximum current rating, inductance value, and DC resistance. A good starting point is to choose an inductor with a saturation current rating above the maximum output current, an inductance value between 1-10uH, and a DC resistance below 100mΩ.
The EN (enable) pin is used to turn the BQ24702PW on and off. To use it, connect the EN pin to a logic-level signal (e.g., from a microcontroller) to enable or disable the converter. When EN is high, the converter is enabled; when EN is low, the converter is disabled.
The output voltage of the BQ24702PW can be adjusted by changing the resistor divider ratio on the FB (feedback) pin. A higher resistor ratio increases the output voltage, while a lower ratio decreases it. Use the formula in the datasheet to calculate the required resistor values.
The thermal derating curve for the BQ24702PW is provided in the datasheet. As the junction temperature increases, the maximum output current decreases. Ensure that the device is properly cooled, and consider using a heat sink or thermal interface material to maintain a safe operating temperature.
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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.
