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Reverse Current Block

The next several slides will deal with Reverse Current Blocking. The PMOS on the left shows a parasitic diode from drain to source that allows current to flow in the case that VOUT has a VF higher than VIN. A simple solution on the right uses back to back PMOS devices to prevent reverse current flow when the two PMOS devices are in the off state. This state will be defined as reverse current blocking. This solution uses two MOSFETs which leads to higher cost and poorer RDS(ON). A new issue arises if the two MOSFETs are in the ON State. The system is now bi-directional and there is no way to limit current when VOUT is greater than VIN. True Reverse Current Blocking is an integrated circuit solution that solves this issue of the ON state switch.

PTM Published on: 2020-11-10