SNVSAT4A September 2017 – June 2021 LP873220-Q1
The inductors L0 and L1 are shown in the Section 8.2. 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 8-1. 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. The 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 conditions. The inductor AC loss 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.
|MANUFACTURER||PART NUMBER||VALUE||DIMENSIONS L × W × H (mm)||RATED DC CURRENT|
ISAT maximum (typical) /
ITEMP maximum (typical) (A)
typical / maximum (mΩ)
|TOKO||DFE252012PD-R47M||0.47 µH (20%)||2.5 × 2 × 1.2||5.2 (–) / 4 (–)(1)||— / 27|
|Tayo Yuden||MDMK2020TR47MMV||0.47 µH (20%)||2 × 2 ×1.2||4.2 (4.8) / 2.3 (2.45)||40 / 46|