The inductors are L0, L1, L2, and L3 are shown in theTypical Application. The inductance and DCR of the inductor affects the control loop of the buck regulator. TI recommends using inductors similar to those listed in Table 53. Pay attention to the saturation current and temperature rise current of the inductor. Check that the saturation current is higher than the peak current limit and the temperature rise current is higher than the maximum expected rms output current. Minimum effective inductance to ensure good performance is 0.22 μH at maximum peak output current over the operating temperature range. DC resistance of the inductor must be less than 0.05 Ω for good efficiency at high-current condition. The inductor AC loss (resistance) also affects conversion efficiency. Higher Q factor at switching frequency usually gives better efficiency at light load to middle load. Shielded inductors are preferred as they radiate less noise.
L × W × H (mm)
|RATED DC CURRENT,
ISAT maximum (typical) / ITEMP maximum (typical) (A)
|DCR typical / maximum (mΩ)|
|TOKO||DFE252012PD-R47M||0.47 µH (20%)||2.5 × 2 × 1.2||5.2 (–) / 4 (–)(1)||- / 27|
|Vishay||IHLP1616AB-1A||0.47 µH (20%)||4.1 × 4.5 × 1.2||– (6 ) / – (6 )(1)||19 / 21|