Digital Green-Mode Synchronous Rectifier Controller

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High performance synchronous rectifier for compact AC/DC adapters

Combined with the MOSFET, the iW673 can emulate the diode rectifier at the secondary side of the flyback to reduce conduction loss. The iW673 determines the timing of the driver by sensing the voltage across the RDS(ON) to achieve lossless sensing. The iW673 uses proprietary digital adaptive turn-off control technology to minimize the turn-off deadtime of the synchronous rectifier so that the parallel Schottky diode required by conventional synchronous rectifiers can be eliminated. The integrated driver has strong driving capability for high efficiency. The operating power consumption of the controller excluding the driver is less than 4mW at no load to achieve the ultra-low no-load power consumption for 5V applications. The iW673 integrates a pulse linear regulator to maintain the operation of the synchronous rectifier at low system output voltage when the system is operating in constant current (CC) mode.

A DiaSIM simulation model is available for the iW673. For more information and where to download, please visit the DiaSIM page.


  • Digital adaptive turn-off control minimizes dead-time and eliminates the parallel Schottky diode
  • Integrated pulse linear regulator (PLR) allows SR operation at low system output voltage down to 2.4V in typical 5V, 2.5A USB charger applications
  • Wide input operating voltage up to 30V


  • Optimized 5V MOSFET gate driver
  • Intelligent low power management achieves ultra-low no-load operating current < 0.65mA
  • Lossless MOSFET VDS sensing for SR timing control
  • 6-pin SOT23 package


  • Compact AC/DC adapters/chargers for media tablets and smart phones

Model Available!



Dialog’s DiaSIM simulation models and tools enable simulation and validation of AC/DC power supplies using highly accurate models for selected products. All models and application circuits are available for download from the support website.


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