SNVSB29C October 2018 – June 2021 LM5143-Q1
Figure 9-21 shows the schematic diagram of a single-output, two-phase synchronous buck regulator with an output voltage of 5 V and rated load current of 15 A. In this example, the target half-load and full-load efficiencies are 93% and 91%, respectively, based on a nominal input voltage of 12 V that ranges from 5 V to 36 V. The switching frequency is set at 2.1 MHz by resistor RRT. The 5-V output is connected to VCCX to reduce IC bias power dissipation and improve light-load efficiency. An output voltage of 3.3 V is also feasible simply by connecting FB1 to VDDA.