A good PCB layout for the BQ24172RGYR involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. TI provides a recommended layout in the datasheet and application notes.
The selection of input and output capacitors depends on the specific application requirements. Generally, X5R or X7R ceramic capacitors with a voltage rating of 10V or higher are recommended. The capacitance value should be at least 4.7uF for the input capacitor and 10uF for the output capacitor.
The BQ24172RGYR can handle input voltages up to 18V, but it's recommended to keep the input voltage below 15V to ensure reliable operation and to prevent overheating.
The BQ24172RGYR output voltage can be configured by connecting a resistor divider network between the output and the ADJ pin. The output voltage is determined by the ratio of the resistors and the internal reference voltage of 0.8V.
The BQ24172RGYR has a thermal shutdown temperature of 150°C. If the device temperature exceeds this limit, it will shut down to prevent damage.
BQ24172RGYR datasheet
by Texas Instruments
