BIAS is connected to the output. This example assumes that inductive short are a risk for this application so a 3-Ω resistor is added between BIAS and the output. A 0.1-µF capacitor is added close the BIAS pin.
FB is connected to the output through a voltage divider in order to create a voltage of 1 V at the FB pin when the output is at 6 V. A 12-pF capacitance is added in parallel with the top feedback resistor in order to improve transient behavior. BIAS and FB are connected to the output via separate traces. This is important to reduce noise and achieve good performances. See Section 11.1 for more details on the proper layout method.
SYNC is connected to ground directly as there is no need for this function in this application.
EN is toggled by an external device (like an MCU for example). A pulldown resistor is placed to ensure the part does not turn on if the external source is not driving the pin (Hi-Z condition).
FPWM is connected to GND. This leads the device
to operate in AUTO mode. In this mode, the switching frequency is adjusted at
light loads to keep efficiency maximum. As a result the switching frequency
changes with the output current until medium load is reached. The device then
switches at the frequency defined by FSW. See Section 8.4 for more details.
A 4.7-µF capacitor is connected between VCC and GND close to the VCC pin. This ensure stable operation of the internal LDO.
RESET is not used in this example so the pin has been left floating. Other possible connections can be seen in the previous typical applications and in Section 8.3.1.
Power components (input capacitor, output capacitor, and inductor) selection can be found here in Section 9.2.1.2.1.