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AC/DC Secondary-Side Controller for Qualcomm® Quick Charge™ 3.0 USB Interface


Qualcomm Quick Charge 3.0 solution companion to the iW1782 or iW1780H

The iW636 is a Rapid Charge™ secondary-side controller for USB interface supporting Qualcomm Quick Charge 3.0 technology and secondary-to-primary communication protocol, that works with the iW1782 or iW1780H primary-side AC/DC digital controller with to enable rapid charging of QC3.0/QC2.0-enabled mobile devices (MDs).

The iW636 integrates an opto-coupler driver that relays commands to the iW1782 or iW1780H AC/DC controllers. These chipsets provide efficiency as high as 90% to enable the higher power density needed for small form-factor fast charging adapters. It also uses Dialog's SmartDefender™ smart hiccup technology to help address soft shorts in cables and connectors.

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


Supports Qualcomm® Quick ChargeTM 3.0 technology High Voltage Dedicated Charging Port (HVDCP) to provide VBUS from 3.6V to 12V in 200mV increments

Double-layer cable protection:

  • Secondary side (iW636): Proprietary D+/D- overvoltage protection (OVP) addresses VBUS D+/Dsoft shorts
  • Primary side (iW1782 or iW1780H): SmartDefender™ smart hiccup technology reduces average output power at fault conditions without latch

Proprietary secondary-to-primary digital communication eliminates discrete decoders in the primary side and simplifies system designs

Single opto-coupler transmits all information for rapid charge: output voltage requests, output current limits, output voltage undershoot (UV), over-voltage protection (OVP), and fault and reset signals

Adaptive OVP/UV detection for most VBUS levels

Backward compatible with QC2.0 and USB Battery Charging Specification Revision 1.2 (USB BC1.2)

Pin-to-pin compatible with iW626

Programmable active fast discharge from a high voltage VBUS level to 5V at mobile device unplug or upon request with built-in switch or external switch

Normally OFF state with <150 µA cut-off current during 5V steady-state operation to achieve <10mW overall system no-load power consumption

Wide operating voltage range from 3V to 16V

Built-in opto-coupler LED driver with minimum driving current of 2mA


Rapid-charging AC/DC adapters for smart phones, tablets, and other portable devices


6-lead SOT-23

Block Diagrams


iW636 Typical Applications Diagram


iW636 Functional Block Diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

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Product Briefs and Summaries
Name Date Version
iW636 Product Summary (487.56 KB) 12/03/2018 1.3
Name Date Version
iW636 Datasheet (680.66 KB) (Registered users only) 12/03/2018 1.4
Reference designs
Name Date Version
Reference Design EBC10110: iW1782-01, iW636-00 and iW673-20 18W, 5V/3A,9V/2A,12V/1.5A QC3.0 High Efficiency Design (4.81 MB) (Registered users only) 20/02/2018 1.0
Reference Design EBC10111: iW1782-01, iW636-02 and iW673-20 21W, 5V/3A,9V/2.3A,12V/1.7A QC3.0 High Efficiency Design (5.01 MB) (Registered users only) 20/02/2018 1.0
Reference Design EBC10112: iW1782-01, iW636-01 and iW673-20 24W, 5V/3A,9V/2.7A,12V/2A QC3.0 High Efficiency Design (5.02 MB) (Registered users only) 20/02/2018 1.0
Name Date Version
Verification: Qualcomm HVDCP Interface Specification Revision J (41.35 KB)