ZHCSIH0C December 2017 – June 2021 LP87702-Q1
Section 9.2 shows the inductors L0, L1, and L2. The inductor's inductance and DCR affects the buck and boost converter's control loop. Table 9-2 lists the recommended inductors, or similar ones, that should be used. Pay attention to the inductor's saturation current and temperature rise current. 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. Section 7 shows the minimum effective inductance that ensures good performance. The inductor's DC resistance should 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 x× H (mm)
|RATED DC CURRENT,
ISAT max / ITEMP max (A)
|DCR typ / max (mΩ)|
|MURATA||DFE252012PD-R47M||0.47 µH (20%)||2.5 × 2 × 1.2||5.2 / 4.0(1)||- / 27|
|TDK||TFM252012ALMAR47MTAA||0.47 µH (20%)||2.5 × 2 × 1.2||5.8 / 4.9(1)||19 / 24|