The charging controller provides the flexibility of the customized designs of different power levels at a relatively low cost. Due to the space-limited nature of the on-board charging, a designer always wants to have fully integrated designs. The BQ25798 provides the option of buck-boost charging design with all MOSFETs and sensing element integrated design as shown by Figure 3-3 in a 4mm x 4mm QFN package [4]. BQ25798 has all the MOSFETs integrated and has been widely adopted for cleaning applications.

Figure 3-3 BQ25798 Fully Integrated Buck-Boost Charger