The LM74700QDBVRQ1 is an automotive AEC Q100 qualified ideal diode controller which operatesin conjunction with an external N-channel MOSFET as an ideal diode rectifier for low loss reversepolarity protection with a 20-mV forward voltage drop. The wide supply input range of 3.2 V to 65 Vallows control of many popular DC bus voltages such as 12-V, 24-V and 48-V automotive batterysystems. The 3.2-V input voltage support is particularly well suited for severe cold crankrequirements in automotive systems. The device can withstand and protect the loads from negativesupply voltages down to –65 V.

The device controls the GATE of the MOSFET to regulate the forward voltage drop at 20-mV.The regulation scheme enables graceful turn off of the MOSFET during a reverse current event andensures zero DC reverse current flow. Fast response (< 0.75 μs) to Reverse Current Blockingmakes the device suitable for systems with output voltage holdup requirements during ISO7637 pulsetesting as well as power fail and input micro-short conditions.

The LM74700QDBVRQ1 controller provides a charge pump gate drive for an external N-channelMOSFET. The high voltage rating of LM74700QDBVRQ1 helps to simplify the system designs for automotiveISO7637 protection. With the enable pin low, the controller is off and draws approximately 1-μA ofcurrent.

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