8.1.3.2 Buck Converter Inductor Selection

For buck converter to operate properly, an inductor of appropriate value must be connected between LBUCK, pin 16, and VOUT, pin 14. The buck converter internal control circuitry is designed to control the switching behavior with a nominal inductance of 10 µH ± 20%. The inductor must have a peak current capability of > 200 mA with a low series resistance (DCR) to maintain high efficiency. The speed of the peak current detect circuit sets the inductor's lower bound to 4.7 µH.  When using a 4.7 µH, the peak inductor current will increase when compared to that of a 10 µH inductor, resulting in slightly higher major frequency. 

A list of inductors recommended for this device is shown in Table 4.