Skip to main content


45W Rapid Charge™ AC/DC Digital Controller


Supports USB Power Delivery, Qualcomm® Quick Charge 4+, and Direct Charge Adapters; Companion to the iW657P USB PD 3.0 Controller

The iW1781 is a 45W output, high performance AC/DC RapidCharge™ power supply controller that supports USB Power Delivery 3.0 (USB PD 3.0) and other rapid charging protocols. 

It is optimized to work with Dialog’s iW657P USB PD interface controller in mobile device adapters to achieve fast and smooth voltage transition on request from the mobile device. The iW657P accepts fast charging protocols, including USB PD 3.0 and transmits all necessary information via an optocoupler to the iW1781, including voltage requests, output current limits, output voltage undershoot, output over-voltage, and fault and reset signals.

A full array of protection features includes Dialog’s SmartDefender™ advanced hiccup technology to address soft short circuits in charger cables and connectors, helping to prevent excessive heat build-up and damage.

See the iW1791 for reduced BOM cost USB PD 3.0 designs up to 27W.

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

Lifecycle status

● Active


Output power up to 45W

Optimized to Work with iW657P to support multiple RapidCharge™ protocols:

  • Qualcomm® Quick Charge 4+
  • Direct Charge

Qualcomm® Quick Charge 4+

Proprietary Secondary-To-Primary Digital Communication and Built-In Decoder: 

Reduces BOM and Significantly Simplifies Design

Single Optocoupler for All Rapid Charging Information

Low No-Load Power Consumption <20mW

High Efficiency up to 90%

Robust Protection Features

  • Output Over-Voltage Protection
  • Over-Current Protection

SmartDefender™ Smart Hiccup Technology 

Helps Protect Cables and Connectors from Excessive Heat and Damage by Reducing Average Power During Short Circuit by at Least 50%


USB PD 3.0, Qualcomm® Quick Charge 4+, Direct Charge, Other RapidCharge Protocols

USB PD 3.0 AC/DC Power Adapters for Smartphones, Tablets, Laptops and Other Mobile Devices 

USB PD 3.0 Power Supplies for Set Top Boxes, Displays, Speakers

USB PD 3.0 in-the-wall receptacles

Lamps and lighting fixtures with USB PD 3.0 ports

Block Diagrams


iW1781 Functional Block Diagram


iW1781 Typical Application Circuit

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.

Sample Request Form

Stay connected

Get in touch with us directly through our worldwide sales offices, or contact one of our global distributors and representatives.

Inquiries Distributors and Representatives Register for newsletters