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11-21-2017

Analog Devices Announces Active Rectifier Controller with Reverse Protection

Analog Devices » LT8672

Analog Devices announces 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 ideal 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 20 mV 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.

Analog Devices - LT8672

The LT8672’s solution 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.

12 V, 5 A Automotive Reverse Battery Protection
12 V, 5 A Automotive Reverse Battery Protection.

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.

Rectification of Input Ripple
Rectification of Input Ripple.

Summary of Features: LT8672

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

Pricing & Availability

Product Sample
Availability
Production
Availability
Price Each
Per 1,000
Package
LT8672 Now Now Starts at $2.25 MSOP-10

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