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True Reverse Current Block Continued

True reverse current blocking has the same structure as the previous slide to control the bulk but also includes a comparator monitoring voltage drop from VOUT to VIN during the ON state to make a logical decision if the Load Switch should be disabled in the event VOUT is greater than VIN. When VOUT exceeds VIN, the monitored delta V across the PMOS is compared to a preset internal node threshold voltage denoted as VT_RCB. When this threshold is exceeded, the PMOS of the Load Switch is disabled. With control of both the parasitic diode path and the gate, the state of the load switch being enabled or disabled does not matter and true reverse current blocking is achieved.

PTM Published on: 2020-11-10