Dialog Supporting Qualcomm's Fast Charging Protocol
Published on: 20th Jan 2014
By: Ian Mansfield
Dialog Semiconductor says that it has developed an AC DC adapter interface IC for use with Qualcomm's Quick Charge 2.0 power supplies.
Qualcomm's Quick Charge 2.0 is a proprietary protocol that aims to charge mobile devices up to 75% faster than conventional USB charging technology.
The new iW620 rapid charge interface IC resides on the secondary side of the AC/DC charger power supply and works with Dialog's iW1760 PrimAccurate primary-side digital pulse width modulation (PWM) controller. Efficiency as high as 88% enables the higher power density needed for smaller form-factor fast charging adapters.
Current sensing is performed by the iW1760 on the primary side, eliminating the need for a secondary-side current sense resistor for an inherently more efficient solution than competing Quick Charge 2.0 wall charger approaches.
"Reducing battery charge time is one of the most compelling trends today in smartphones," said Mark Tyndall, Senior VP Corporate Development & Strategy, GM Power Conversion Business Group at Dialog Semiconductor. "Dialog is excited to debut the first primary-side regulation solution for Quick Charge 2.0, delivering on our goal to be an early provider of high power density rapid charge solutions."