LM74720-Q1 Automotive Grade Low IQ Ideal Diode Controller

     Texas Instruments' LM74720-Q1 Ideal Diode Controller drives and controls external back-to-back N-channel MOSFETs to simulate an ideal diode rectifier with power path on/off control and overvoltage protection. The wide input supply range of 3 V to 65 V allows protection and control of 12 V and 24 V automotive battery powered ECUs. The device can withstand and protect loads from negative supply voltages down to -65 V. An integrated ideal diode controller (GATE) drives the first MOSFET to replace the Schottky diode for reverse input protection and output voltage holdup.

     Powerful boost regulator with fast turn-on and turn-off comparators ensures robust and efficient MOSFETs during automotive testing (e.g. ISO16750 or LV124, where ECUs are subject to short input interruptions and superimposed AC input signals up to 100 kHz frequency) switch performance. Low quiescent current of 35 µA (max) in operation enables always-on system designs. With a second MOSFET in the power path, the LM74720-Q1 allows load-disconnect control using the EN pin. When EN is low, the quiescent current drops to 3.3 μA (max). The device features adjustable overvoltage shutdown protection for load dump protection.