LM74720-Q1 Automotive, Low IQ Ideal Diode Controller

Texas Instruments' LM74720-Q1 ideal diode controller drives and controls external back-to-back N-Channel MOSFETs to emulate 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 the loads from negative supply voltages down to -65 V. An integrated ideal diode controller (GATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup.

A strong boost regulator with fast turn-on and turn-off comparators ensures robust and efficient MOSFET switching performance during automotive testing such as ISO16750 or LV124 where an ECU is subjected to input short interruptions and AC superimpose input signals up to 100 kHz frequency. The low quiescent current 35 µA (maximum) 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. The quiescent current reduces to 3.3 μA (maximum) with EN low. The device features an adjustable overvoltage cutoff protection feature for load dump protection.