Secondary-Side Interface IC Supports Qualcomm® Quick Charge™ 2.0 Technology Adapters with D+/D- OVP Protection

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Secondary-side controller allowing rapid charging of QC2.0-enabled mobile devices

The iW629 is a Rapid Charge™ secondary-side interface and communication IC that works with the iW1780 primary-side AC/DC digital controller to support low-cost Qualcomm Quick Charge 2.0 adapter solutions for smartphone and tablet power supplies, with double-layer cable protection features.

The iW629 integrates Dialog’s proprietary secondary-to-primary digital communication technique using an optocoupler to relay commands to the iW1780 AC/DC controller.  The iW629+iW1780 chipset provides efficiency as high as 88% to enable the higher power density needed for small form-factor fast charging adapters.

The iW629 includes a proprietary overvoltage protection feature for the D+/D- pins on the USB connector that, along with the SmartDefender™ advanced hiccup technology integrated in the iW1780, provides cable soft-short protection on both the primary and secondary sides. Learn more about SmartDefender advanced hiccup technology here.

Qualcomm® Quick Charge™ is a product of Qualcomm Technologies, Inc.

See Primary-Side Controller iW1780


  • Supports Qualcomm® Quick Charge™ 2.0 Technology High Voltage Dedicated Charging Port (HVDCP) Applications – 5V and 9V outputs.
  • Double-layer Cable Protection
    • Secondary Side (iW629):  Proprietary D+/D- Over-Voltage Protection (OVP) Addresses VBUS D+/D- Soft Shorts
    • Primary Side (iW1780):  SmartDefender™ Smart Hiccup Technology in iW1780 Reduces Average Output Power at Fault Conditions without Latch
  • Backward Compatible with USB Battery Charging Specification Revision 1.2 (USB BC1.2) Dedicated Charging Port (DCP)
  • Pin-to-Pin Compatible with iW626


  • Proprietary Secondary-Primary Communication Technology
    • Relays Output Voltage Requests, Output Current Limits, Output Voltage Undershoot and Output Over-Voltage Protection, Fault and Reset Signals
    • Single Optocoupler Relays Information from iW629 (Secondary) to iW1780 (Primary)
  • Programmable Active Fast Discharge Switch
    • Quickly Discharges VOUT from 9V to 5V at Portable Device Unplug or Upon Request
  • <10mW No-Load Standby Power Consumption at 5V Steady-State Operation
  • 6-lead SOT-23 package
  • Additional protection features
    • Pin-to-pin short circuit protection
    • Floating pin detection


  • Rapid Charge™ power adapters for mobile electronics
  • Qualcomm® Quick Charge™ 2.0 technology HVDCP (5V, 9V) adapters

Block Diagrams

Typical applications diagram
Functional block diagram


Product Briefs and Summaries
Date Version
iW629 Product Summary 12/10/2015 Rev. 0.5

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