A 4-layer PCB with a solid ground plane and a separate layer for the high-current paths is recommended. Ensure that the input and output capacitors are placed close to the IC, and the inductor is placed close to the output capacitors.
Choose an inductor with a high saturation current rating, low DC resistance, and a suitable inductance value (e.g., 1-10 μH). Consider the inductor's physical size, core material, and operating frequency when making your selection.
The maximum input voltage is 18V, but it's recommended to keep the input voltage below 15V to ensure reliable operation and minimize power losses.
The soft-start feature is enabled by connecting the SS pin to a capacitor (e.g., 10 nF) and a resistor (e.g., 10 kΩ) in series. The capacitor value determines the soft-start time, and the resistor value sets the soft-start current limit.
The EN (enable) pin is used to turn the converter on and off. Connect the EN pin to a logic signal (e.g., from a microcontroller) to enable or disable the converter. A high logic level (e.g., 3.3V) enables the converter, while a low logic level (e.g., 0V) disables it.
BQ24735RGRR datasheet
by Texas Instruments
