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Digital Synchronous Rectifier Replaces Schottky Diode for Higher Efficiency, Ultra-Compact Offline Power Supplies

The iW673 is recommended for new designs.


Synchronous rectifier controller replaces schottky diode

The iW671 secondary-side synchronous rectifier controller complements several of Dialog’s primary-side controllers to deliver the high efficiency needed for high power density power supplies and power adapters. The iW671 uses proprietary digital adaptive turn-off control technology to replace the secondary-side Schottky diode with a MOSFET for high power density power supplies.  While conventional synchronous rectifier designs require the use of a Schottky diode in parallel with the synchronous rectifier to maintain efficiency, an inherently higher cost approach, the adaptive control in the iW671 minimizes dead-time and eliminates this need.  More efficient than the diodes it replaces, the iW671 is also more efficient than conventional synchronous rectifiers.

With an integrated adaptive voltage monitor function, the iW671 works with the iW1766C1 primary-side PWM controller to enable the high power density needed for small form-factor power supplies with lower output ripple, ultra-low standby power and ultra-fast dynamic load response (DLR).


Lifecycle status



Eliminates Parallel Schottky Diode

  • Higher Efficiency, Lower BOM Cost

Ultra-Fast Dynamic Load Response (DLR)

  • Integrated Adaptive Voltage Position Monitor

Ultra-Low No-Load Operating Current < 0.65mA

Ultra-Low No-Load Standby Power

  • <15mW (iW1766C1 + iW671)

Wide Input Voltage Range up to 30V

Integrated, Optimized 5V MOSFET Gate Driver

Integrated Pulse Linear Regulator for Operation Down to 2V Supply Voltage

Works with iW1699, iW1699B, iW1760, iW760B, iW1766, iW1767

iW1766C1, iW1787 Optimized to Work with iW671 for Lowest Output Ripple


iW1766C1+iW671: Compact power adapters for smartphones, media tablets

Block Diagrams


Typical applications diagram


Functional block diagram

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Product Briefs and Summaries
Name Date Version
iW671 Product Summary (522.63 KB) 28/03/2017 1.2
Name Date Version
iW671 Datasheet (892.11 KB) (Registered users only) 28/03/2017 1.21
Reference designs
Name Date Version
Reference Design EBC10065: iW1699-05 and iW671-00, 5.2V/2.4A, 90-264VAC, 75mW No-Load, Low Output Ripple Travel Adapter Design (1.81 MB) (Registered users only) 12/02/2016 1.0
Reference Design EBC10075: iW1699B and iW671 for Universal Input, 5V/3A Output Small Size Charger Design (2.52 MB) (Registered users only) 18/11/2015 1.0
Reference Design EBC10117: iW1782-00 and iW671-00 24W USB PD 5V/3A,6V/3A,7V/3A,8V/3A,9V/2.7A,12V/2A High Efficiency Design (4.35 MB) (Registered users only) 16/05/2017 1.0
White Papers & Technical Articles
Name Date Version
White Paper : International External Power Supply Regulations (219.09 KB) (Registered users only) 01/09/2014 A