Overview

Combined with a 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 RDSON to achieve lossless sensing. The iW673 uses proprietary digital adaptive turn-off control technology to minimize the turn-off dead time 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, visit the DiaSIM page.

iW673 Typical Applications Diagram
iW673 Typical Applications Diagram
  • 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

Applications

Documentation

Design & Development

Software & Tools
DiaSIM™ Simulation Models
DiaSIM simulation models let the user test and validate AC/DC power supply designs prior to prototyping.
Downloads
NL5 Quick Start Guide
 Simulator Renesas
1 item

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Product Options

    Processing table
    Pkg. Type
    Carrier Type
    Moisture Sensitivity Level (MSL)
    Buy / Sample
    Part Number
    iW673-00
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    		SOT23-6L Tape & Reel 1
    IW673-01
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    		SOT23-6L Tape & Reel 1
    iW673-10
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    		SOT23-6L Tape & Reel 1
    IW673-20
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    		SOT23-6L Tape & Reel 1
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