Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general guidelines for switching regulator layout, such as keeping the input and output capacitors close to the IC, and using a solid ground plane to reduce noise and EMI.
To ensure stability, make sure to follow the recommended component values and layout, and also add a small ceramic capacitor (e.g. 10nF) between the VCC pin and GND to filter out high-frequency noise. Additionally, ensure that the input voltage is within the recommended range and the output capacitor is of sufficient value and type.
The BQ4017YMC-70 is rated for operation from -40°C to 85°C, but it's recommended to derate the output current and voltage at higher temperatures to ensure reliable operation.
While the BQ4017YMC-70 is a high-quality device, it's not specifically designed for high-reliability or automotive applications. For such applications, it's recommended to use devices that are specifically qualified and certified for those markets, such as the AEC-Q100 qualified devices from Texas Instruments.
To troubleshoot issues, start by checking the input voltage, output voltage, and output current to ensure they are within the recommended ranges. Also, check the PCB layout and component values to ensure they match the recommended values. Use an oscilloscope to check for oscillations or noise on the output voltage. If the issue persists, consult the datasheet and application notes, or contact Texas Instruments support for further assistance.
BQ4017YMC-70 datasheet
by Texas Instruments
