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iW1788
36W High Power MediaTek Pump Express™ Plus-Compatible Digital PWM AC/DC Controller
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.
Features
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
Applications
Compact AC/DC power supplies and power adapters for portable electronics
Rapid Charge™ enabled adapters for smartphones
Linear AC/DC replacement
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.
For 5.0W – 7.5W output power MediaTek Pump Express-compatible controller, see iW1680.
Block Diagrams
Typical Applications Diagram
Functional Block Diagram
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