Suitable for automotive applications that must operate under dump transient conditions

Analog Devices announced the launch of Power by Linear LT8672, a new active rectifier controller that supports reverse input voltage protection up to -40V.

The new product features a wide input voltage range of 3V to 42V, making it suitable for automotive applications that must operate at minimum input voltages as low as 3.0V during cold crank and stop-start conditions, as well as under load dump transient conditions up to 40V.

The LT8672 drives an external N-channel MOSFET and provides a 20mV voltage drop, reducing heat generation by approximately 90% compared to Schottky diodes, thereby eliminating the need for costly heatsinks. With extremely fast transient response speed, it meets the stringent requirements of automotive applications demanding AC input ripple rectification up to 100kHz. Additionally, standby current consumption is as low as 20µA during operation and 3.5µA during shutdown, making it ideal for always-on systems. Being provided in an MSOP-10 package, it ensures a compact solution footprint even when combined with external MOSFETs.

The LT8672 solution combines a 3V minimum input voltage characteristic with a 20mV voltage drop characteristic, easily meeting minimum input voltage requirements during cold crank and stop-start conditions while enabling simpler and more efficient circuit design. When the input power supply experiences a fault or short circuit, it quickly shuts down the power, minimizing reverse current transients. A power good pin signal is also provided when the external MOSFET becomes capable of supplying current to the load.

The LT8672EMS is provided in an MSOP-10 package. The industrial temperature version LT8672IMS has been tested to operate over a temperature range of –40°C to 125°C, while the high-temperature version LT8672HMS has been tested to operate over a temperature range of –40°C to 150°C.