The LT8672, an active rectifier controller with reverse input protection to -40 V, features a 3-V to 42-V input voltage, making it suitable for automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages as low as 3.0 V and load-dump transients up to 40 V.The LT8672 drives an external N-channel MOSFET, offering a 20-mV drop, reducing power dissipation by 90%, compared to a Schottky diode, eliminating requirements for a heat sink.The fast transient response enables it to meet automotive applications requiring AC input ripple rectification up to 100 kHz. Additionally, its 20-uA quiescent current while operating, and 3.5-uA in shutdown, are suitable for always-on systems. The combination of the MSOP-10 package and external MOSFET ensures a compact solution footprint.The LT8672's solution offers the combination of 3-V minimum output capability and a 20-mV drop, enabling it to ease the minimum input voltage requirement during cold-crank and stop-start, providing simpler and more efficient circuits. If the input power source fails or is shorted, a fast turn-off minimizes the reverse-current transients. Also, a power-good pin signals when the external MOSFET is ready to take load current.
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