SNVSAZ9 March 2022 LP8764-Q1
PRODUCTION DATA
The buck inductors L1, L2, L3, and L4 are shown in the Section 9.2. 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 9-2. 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. DC resistance of the inductor must be minimized 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.
Inductors must be chosen based on the phase configuration, switching frequency, and output voltage. See table below for selecting inductance.
Phase | fSW (MHz) | VOUT (V) | Inductance (nH) |
---|---|---|---|
Multiphase | 2.2 | 0.3 - 1.9 | 470 |
4.4 | 220 | ||
Single Phase | 2.2 | 0.3 - 3.34 | 1000 |
0.5 - 0.7 (DDR Termination) | 470 | ||
4.4 | 0.3 - 1.9 | 220 | |
1.9 - 3.34 | 470 |
Recommended inductors based on these requirements are shown below.
MANUFACTURER | PART NUMBER | VALUE | DIMENSIONS L × W × H (mm) |
RATED DC
CURRENT, ISAT typical (maximum) / ITEMP typical (maximum) (A) |
DCR typical (maximum) (mΩ) |
---|---|---|---|---|---|
TDK | TFM322512ALMA1R0MTAA | 1.0 µH (20%) | 3.2 × 2.5 × 1.2 | 5.1 (4.6) / 4.4 (4.0) | 30 (37) |
Murata | DFE322520FD-1R0M=P2 | 1.0 µH (20%) | 3.2 × 2.5 × 2.0 | – (7.5) / – (4.1) | - (22) |
TDK | TFM322512ALMAR47MTAA | 0.47 µH (20%) | 3.2 × 2.5 × 1.2 | 7.6 (6.9) / 6.1 (5.3) | 16 (21) |
TDK | TFM252012ALMAR47MTAA | 0.47 µH (20%) | 2.5 × 2.0 × 1.2 | 6.5 (5.8) / 5.6 (4.9) | 19 (24) |
TDK | TFM201610ALMAR47MTAA | 0.47 µH (20%) | 2.0 × 1.6 × 1.0 | 5.0 (4.5) / 4.5 (3.9) | 28 (39) |
Murata | DFE252012PD-R47M | 0.47 µH (20%) | 2.5 × 2.0 × 1.2 | – (5.2) / – (4)(1) | - (27) |
Murata | DFE2HCAHR47MJ0 | 0.47 µH (20%) | 2.5 × 2.0 × 1.2 | – (5.1) / – (4.5) | 19 (25) |
TDK | TFM322512ALMAR22MTAA | 0.22 µH (20%) | 3.2 × 2.5 × 1.2 | 10 (9.5) / 9.5 (7.3) | 6 (11) |
TDK | TFM252012ALMA | 0.22 µH (20%) | 2.5 × 2.0 × 1.2 | 9 (8) / 8.5 (6.7) | 8 (13) |
TDK | TFM201610ALMAR24MTAA | 0.24 µH (20%) | 2.0 × 1.6 × 1.0 | 6.5 (5.9) / 6.2 (5.0) | 15 (23) |
Murata | DFE2MCAHR24MJ0 | 0.24 µH (20%) | 2.5 × 2.0 × 1.2 | – (5.0) / – (4.2) | – (25) |