Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good PCB design practices, such as keeping the high-current paths short and wide, using a solid ground plane, and placing the device close to the battery. Additionally, ensure that the PCB layout is symmetrical to minimize electromagnetic interference (EMI).
The sense resistor value depends on the desired current sensing range and the input voltage. A smaller sense resistor value provides a higher current sensing range but increases the power loss. A larger sense resistor value reduces power loss but limits the current sensing range. TI provides a sense resistor calculation tool to help with the selection.
The EN (enable) pin is used to enable or disable the device. When the EN pin is high, the device is enabled, and when it's 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.
The BQ29704DSET has built-in OCP and SCP features. To handle these events, connect the OCP and SCP pins to a microcontroller or a dedicated fault handler. When an overcurrent or short-circuit event occurs, the device will pull the OCP or SCP pin low, and the system can respond accordingly, such as by shutting down the device or alerting the user.
The recommended input capacitor value is 10 μF to 22 μF, and the type should be a low-ESR ceramic capacitor. This capacitor helps to filter the input voltage and reduce noise. Ensure that the capacitor is placed close to the device's input pins to minimize noise and improve performance.
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BQ29704DSET Overview
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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.
