36W High Power MediaTek Pump Express™ Plus-Compatible Digital PWM AC/DC Controller

Not Recommended for New Designs

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Not Recommended for New Designs

High efficiency for small form factor adapters

The iW1788 is a highly integrated AC/DC off-line power supply controller designed to be compatible with MediaTek’s Pump Express™ Plus fast charge protocol for smartphones and tablets.  The iW1788 is a single-chip solution for output power up to 36W that uses Dialog’s intelligent Rapid Charge™ digital algorithm and digital PrimAccurate™ primary-side control to significantly reduce charge times in USB AC/DC power adapters.

The iW1788 is highly efficient, and offers no-load standby power < 30mW, meeting the US Department of Energy’s external power supply efficiency requirements and Version 5, Tier 2 of the EU’s Code of Conduct for external power supplies.  The iW1788 also offers a full array of protection features including overvoltage, short circuit and over-temperature protection.

MediaTek’s Pump Express Plus protocol enables up to 45% faster charging times (compared to conventional chargers) for smartphones and media tablets.  The iW1788 uses Dialog’s intelligent Rapid Charge™ technology, enabling adapters that can scale the output voltage from 3.6V to 12V to optimize charging times for high capacity batteries.

The iW1788 also incorporates Dialog's SmartDefender™ smart hiccup technology to help address soft short circuits in cables and connectors.  Learn more about SmartDefender smart hiccup technology here. 

For 5.0W – 7.5W output power MediaTek Pump Express-compatible controller, see iW1680. 


  • Supports MediaTek Pump Express™ Plus fast charge protocol
  • 24W PrimAccurate™ isolated off-line controller
    • Eliminates secondary-side regulator and optical feedback isolator
  • Built-in digital intelligence on primary side for intelligent dynamic voltage scaling to optimize charge time
  • Meets DoE External Power Supply and EU Code of Conduct Version 5, Tier 2 standards
    • < 30mW no-load power consumption
  • Adaptive Multi-Mode PWM/PFM control improves efficiency
  • No audible noise over the entire operating range
  • Active start-up scheme enables fastest possible start-up


  • Cable drop compensation – configurable
  • Low EMI design
  • No external compensation needed
  • SmartDefender™ Smart Hiccup Technology
    • Helps Address Soft-Shorts in Cables, Connectors without Latching Off
    • Helps Protect Cables and Connectors from Excessive Heat and Damage by Reducing Average Power During Short Circuit by at Least 50%
  • Fully protected from fault conditions
    • Over-temperature protection
    • Output short circuit
    • Output low impedance
    • Output overvoltage


  • Compact AC/DC power supplies and power adapters for portable electronics
  • Rapid Charge™ enabled adapters for smartphones
  • Linear AC/DC replacement

Block Diagrams

Typical Applications Diagram
Functional Block Diagram


Product Briefs and Summaries
Date Version
iW1788 Product Summary 24/02/2016 Rev. 1.1

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