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45W RapidCharge™ AC/DC Digital Controller with XM-Comm Technology and Advanced Protection Features


Supports Qualcomm® Quick Charge™ 3.0 with No Optocoupler; Companion to iW662

The iW1798 is a 45W output, high performance AC/DC RapidCharge™ power supply controller that integrates Dialog’s XM-Comm technology, eliminating all optocouplers from travel adapters to reduce cost and improve reliability. It supports Qualcomm Quick Charge 3.0, 2.0 and other rapid charging protocols.

The iW1798 is optimized to work with Dialog’s iW662 secondary-side synchronous rectifier controller and rapid charge interface IC. The secondary-side IC uses XM-Comm technology to transmit all necessary information via an optocoupler to the iW1798, including voltage requests, output current limits, output voltage undershoot, output over-voltage, and fault and reset signals.

The device offers a full array of advanced protection features, including an advanced fault protection technology that reduces power during a fault, an X-Cap discharge function to safely discharge the input capacitor when the travel adapter is unplugged, and Dialog’s advanced fault control technology to address soft short circuits in charger cables and connectors without latching off the output.

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

Lifecycle status

● Active


Output power - 45W+

Optimized to Work with iW662 to Support Multiple RapidCharge Protocols:

  • Qualcomm® Quick Charge™ 3.0
  • Qualcomm® Quick Charge™ 2.0

XM-Comm - Proprietary Secondary-To-Primary Digital Communication via Power Transformer:

  • Reduces BOM and Significantly Simplifies Design
  • Handles All Rapid Charging Information

Ultra-Low No-Load Power Consumption

  • <75mW with Ample Margin at 230VAC
  • <20mW with External Active Start-Up Circuit

Robust Protection Features

  • Output Over-Voltage Protection or X-Cap Discharge
  • Over-Current Protection
  • SD pin for external NTC Temperature Protection

Advanced Fault Control Technology

  • Helps Protect Cables and Connectors from Excessive Heat and Damage by Reducing Average Power without Needing a Latch


RapidCharge AC/DC Power Adapters for Smartphones, Tablets and Other Mobile Devices Using  Qualcomm Quick Charge 3.0, 2.0 and other Protocols

Block Diagrams


Typical Applications Diagram


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
iW1798 Product Summary (448.02 KB) 19/12/2019 0.3
Name Date Version
iW1798 Datasheet (944.18 KB) (Registered users only) 19/12/2019 0.5