Figure 8-6. Two Devices, Active ORing Configuration

The linear ORing mechanism in LM7311 maintain that there's no reverse current flowing from one power source

to the other during fast or slow ramp of either supply.

The following waveform illustrates the active ORing behavior when the supply rails are being ramped up

sequentially.

Figure 8-7. Active ORing Response

When the bus voltages (IN1 and IN2) are matched, device in each path sees a forward voltage drop and is

ON delivering the load current. During this period, current is shared between the rails in the ratio of differential

voltage drop across each device.

In addition to supply ORing, the devices protect the system from overvoltage, excessive inrush current, overload

and short-circuit faults at all times.

Note

ORing can be done either between two similar rails or between dissimilar rails. For ORing cases with

skewed voltage combinations, the dVdt pin capacitor rating must be chosen based on the highest of

the 2 supplies. Refer to Recommended Operating Conditions table for more details.

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LM7311

SLVSKK8 – AUGUST 2026

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