When the MODE pin is pulled below 0.35 V, the device enters a diode mode of operation. When both inputs are applied to the device, the highest voltage is used to power the output. The PR1 pin is used as an active low device enable, turning off the device when it is pulled high. When the device is turned back on, soft start is used to power the output. The expected behavior for the device is shown in Figure 7-2. It is not recommended to use diode operation for two inputs of the same voltage, that is when the device is to multiplex and to connect one input channel to the output. In the event that the input voltage sources are prone to droop in voltage when loaded, it is also recommended to use input capacitance to stabilize the rails. This can especially aid in providing stable input rails during switchover in diode mode.

Figure 7-2 Diode Mode Switching