Active rectifier controller with reverse protection
Power by Linear LT8672 is an active rectifier controller from Analog Devices that has reverse input protection to -40V. Its 3V to 42V input voltage capability suits automotive applications that must regulate through cold-crank and stop-start scenarios with minimum input voltages down to 3.0V and load dump transients up to 40V.
The LT8672 drives an external N-channel MOSFET, offering a 20mV drop, reducing power dissipation by 90 per cent compared with a Schottky diode, eliminating the need for a heat sink. The ultrafast transient response enables it to meet stringent automotive applications requiring AC input ripple rectification up to 100kHz.
In addition, says Analog Devices, the controller’s 20-microA quiescent current while operating and 3.5-microA in shutdown suit 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 3V minimum input capability and a 20mV drop, enabling it to ease the minimum input voltage requirement during cold-crank and stop-start, which Analog Devices says provides simpler and more efficient circuits. If the input power source fails or is shorted, a very fast turn-off minimises reverse current transients. Also, a power good pin signals when the external MOSFET is ready to take load current.
The LT8672EMS is packaged in an MSOP-10 package. An industrial temperature version, the LT8672IMS, is tested and guaranteed to operate from a -40 degrees C to 125 degrees C operating junction temperature.
Analog Devices emphasises that the LT8672HMS version is tested and guaranteed to operate from a -40 degrees C to 150 degrees C operating junction temperature.
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