Active Rectifier Controller Has Reverse Protection

Analog Devices has announced the Power by Linear LT8672, an active rectifier controller with reverse input protection to –40 V. Its 3 V to 42 V input voltage capability is well suited for automotive applications which 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 20mV drop, reducing power dissipation by 90% compared to a Schottky diode, eliminating requirements for a costly heat sink. The ultrafast transient response enables it to meet stringent automotive applications requiring AC input ripple rectification up to 100 kHz. Additionally, its 20 µA quiescent current while operating and 3.5 µA in shutdown are ideal for always-on systems. The combination of the MSOP-10 package and external MOSFET ensures a compact solution footprint.

LT8672The LT8672 offers the combination of 3 V minimum input 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 very fast turn-off minimizes 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°C to 125°C operating junction temperature. The LT8672HMS version is tested and guaranteed to operate from a –40°C to 150°C operating junction temperature.

Summary of Features:

  •     Reverse Input Protection to –40V
  •     Wide Operating Voltage Range: 3V to 42V
  •     Low 20µA Quiescent Current in Operation
  •     Improved Performance Compared to a Schottky Diode:
    •         Reduce Power Dissipation by >90%
    •         Reduce Drop to 20mV
  •     Ultrafast Transient Response
    •         Rectifies 6VP-P Up to 50kHz
    •         Rectifies 2VP-P Up to 100kHz
  •     Low 3.5µA Shutdown Current
  •     Accurate 1.21V Enable Pin Threshold
  •     Available in Small 10-Lead MSOP

Analog Devices | www.analog.com