18.104.22.168 VBUS Input Only
In this scenario, only single input is connected to VBUS directly, no back-to-back power MOSFETs are required. VAC1 and VAC2 are recommended to be shorted to VBUS. Both ACDRV1 and ACDRV2 need to be pulled down to GND, as shown in the figure below.
Figure 13. Single Input Connected to VBUS Directly Without ACFET-RBFET
- At POR, the charger detects no ACFETs-RBFETs are present by sensing that the ACDRV1 and ACDRV2 pins both shorted to GND.
- The charger updates the status bits ACRB1_STAT and ACRB2_STAT to 0, and locks EN_ACDRV1 = 0 and EN_ACDRV2 = 0.
- VAC1 and VAC2 are connected to VBUS directly. The ACDRV1 and ACDRV2 pins always stay low.