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100W Digital Zero Voltage Switching RapidCharge™ AC/DC Controller


Pairs with iW709 to Create a Complete Solution for High-Power Density USB PD 3.0 Chargers and Travel Adapters

The iW9801 digital AC/DC controller integrates Dialog’s patented adaptive Zero Voltage Switching (ZVS) technology to enable ultra-small, light-weight, low-cost and easily portable power supplies for smartphones, tablets, laptops, power tools and other portable products.  The device operates at high switching frequencies, which allows for a much smaller transformer and passive components, and supports USB Power Delivery 3.0 with PPS, along with other RapidCharge protocols at output powers up to 100W.

The iW9801 pairs with Dialog’s iW709 secondary-side IC, which integrates fast charge protocol support, USB Type-C® control and synchronous rectification FET control. The combined chipset offers a complete high power density AC/DC charging solution, efficiencies up to 94% and advanced protection features to enable high power charging with safe, cool operation in a small physical charger size.

Learn more about Dialog's patented adaptive ZVS technology.

Lifecycle status

● Active


High switching frequency

  • Lighter, smaller transformer
  • Smaller passive components for easier EMI control

Patented adaptive ZVS control for high efficiency and low EMI

  • Efficiently recycles energy to minimize heat generation
  • Up to 94% efficiency
  • Eases thermal management and reduces heatsink size

User-configurable ZVS timing optimizes performance for different power MOSFETs

Adaptive, seamless multi-mode control (MMC) improves efficiency and eliminates audible noise

Compatible to drive GaN devices

AC unplug detection and X-cap discharge

Rich protection for:

  • Over-voltage (OVP)
  • Over-current (OCP)
  • User-configurable over-temperature
  • Shoot-through
  • Brown-in/brown-out
  • Output short
  • Extra primary-side OCP & OVP if optocoupler fails

Intelligent, eco-friendly low standby power < 20mW

Supports USB Power Delivery 3.0 with PPS (iW709)

Hardwired state-machine solution prevents hacking of fast chargers. Learn more


Low-Cost, Ultra-Small, Light-Weight RapidCharge AC/DC Power Supplies and Adapters for Smartphones, Tablets, Laptops, Power Tools and Other Portable Devices Using USB PD

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.

Sample Request Form

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Product Briefs and Summaries
Name Date Version
iW9801 Product Summary (516.92 KB) 25/07/2021 1.1
Name Date Version
iW9801 Datasheet (839.52 KB) (Registered users only) 25/07/2021 1.1
Reference designs
Name Date Version
Reference Design EBC10245: iW9801-11 iW709-45-A8-02 45W ZVS Design (3.94 MB) (Registered users only) 14/04/2022 2.0
Reference Design EBC10246: iW9801 - 11 iW709-65-A7-04 65W USB PD ZVS Design (6.78 MB) (Registered users only) 22/06/2021 1.0