BQ24753A: How to choice inductor?

Hi Webber,

Section 9.2.2.2 in the datasheet provides guidelines on selecting an inductor. Specifically, Isat should be greater than Ichg + 0.5*Iripple. However, it's good to include some extra margin here. For example, the design example in Figure 37 uses the IHLP5050CE-01 inductor, which has Idc = 8.5 A and Isat = 16 A even though Ichg is only 3 A. The IHLP5050CE-01 inductor would also work for your application since your Ichg is only 2 A. Additionally, this inductor has a much lower DCR than the one in your schematic (24.8 mΩ vs. 188 mΩ).

For more details about inductor selection, you can also refer to this application report:

http://www.ti.com/lit/an/snva038b/snva038b.pdf

However, please note that the BQ24753A is NRND (not recommended for new designs). If you let me know your requirements, I can suggest a newer charger which can suit your application.

Best regards,

Angelo