Monolithic Power Systems (MPS) has introduced the MPQ5852-AEC1, a smart diode controller that can drive an external N-MOSFET to replace a Schottky diode for reverse-input protection. The device’s 20 mV ultra-low dropout minimizes power loss and enables a low minimum input voltage (V_IN). It's 4 μA standby current makes it ideal for battery-powered applications. The ultra-fast transient response ensures that the MPQ5852-AEC1 can rectify the AC frequency up to 100 kHz.

The MPQ5852-AEC1 integrates an internal boost to provide a boost voltage that turns on the external N-channel MOSFET, even at low input voltage. With an extremely low under-voltage (UV) threshold, the device provides a wide operating range to meet the harsh start-up conditions defined in ISO16750. The device also supports cold-crank voltages down to 0 V.

In addition to reverse-polarity protection and reverse-pulse protection, the MPQ5852-AEC1 also provides multiple diagnostics for automotive electronic control units (ECUs) during fault conditions, such as under-voltage (UV), over-voltage (OV), and over-temperature (OT) conditions.

Key features of MPQ5852-AEC1

• Built to Handle Tough Automotive Transients and Meets AEC-Q100 Requirement: 
  • Load Dump Up to 42 V
  • -40V Reverse-Polarity Voltage
  • Cold Crank Down to 0 V
  • Rectifies AC Frequency Up to 100 kHz
  • Available in AEC-Q100 Grade 1
• Cooler Thermals: 
  • Strong Gate Drive Ability and Small Switching Loss
  • 20 mV Ultra-Low Dropout
• Extends Vehicle Battery Life: 
  • Low Quiescent Current (I_Q) during Standby (4 μA)
  • Low I_Q in Rectify Mode (30 μA)
  • DIAG_EN Pin to Disable Diagnostic for Low-I_Q Operation
• Reduces Board Size: 
  • Available in a QFN-13 (3 mm x 3 mm) Package
  • Available in Wettable Flanks
• Robust Protection and Diagnostics: 
  • Battery and Load Under-Voltage (UV) and Over-Voltage (OV) Monitoring
  • Battery Voltage (V_BATT) Sensing
  • Over-Temperature (OT) Warning
  • Fault Indication via the FT Pin
• Functional Safety System Design Capability: 
  • MPSafe^TM-Compatible: Functional Safety Supporting Document Available