The main parameter for the inductor selection is the inductor value and then the saturation current of the inductor. To calculate the maximum inductor current under static load conditions, Equation 4 is given.
TI recommends choosing the saturation current for the inductor 20% to 30% higher than the IL,MAX, out of Equation 4. A higher inductor value is also useful to lower ripple current but increases the transient response time as well. The following inductors are recommended to be used in designs.
|CURRENT RATING |
L × W × H [mm3]
|DC RESISTANCE |
|0.47||6.6||4 × 4 × 1.5||7.6||Coilcraft XFL4015-471|
|0.47||6.7||3.2 × 2.5 × 1.2||23||Murata DFE322512F-R47N|
|1||5.1||4 × 4 × 2||10.8||Coilcraft XFL4020-102|