Ultra-high power 40W controller supports Qi wireless charging

January 06, 2017 // By Nick Flaherty
Semtech has launched a dual mode, backwards-compatible and highly efficient 40W wireless charging controller that also supports the Qi standard in a small form factor.

The LinkCharge 40 Series of wireless charging transmitters and receivers launched at the Consumer Electronics Show (CES) this week support applications requiring up to 40 watts of power with the Semtech prorietary protocol and 15W for Qi-based links.

“The addition of this 40 watt, highly differentiated, ultra-high power wireless charging capability to Semtech’s LinkCharge platform makes our robust and scalable wireless charging technology available for products of all sizes and power requirements,” said Ruwanga Dassanayake, Product Line Manager for Semtech’s Power and High-Reliability Products Group. “One of the unique features that sets LinkCharge 40 apart is that its transmitter is backwards compatible, supporting Qi-enabled phones while maintaining small form factor at both ends of the solution.”

The high power system architecture of the LinkCharge 40 uses a flexible firmware-based approach and proprietary communication protocol between the transmitter and receiver at 40 watts and uses the WPC (Wireless Power Consortium) or Qi standard protocol at lower power. The controller uses a DC-DC converter with efficiency at 85 percent, providing 19 V and 2A at the receiver with support for dynamic loads and multiple coil configurations.

“Implementations of the latest Qi specification deliver up to 15 watts of wireless power,” said Menno Treffers, Chairman of the Wireless Power Consortium. “Semtech now demonstrates that it is possible to deliver considerably more power while maintaining compatibility with existing Qi power receivers. We welcome this extension to the Qi ecosystem.”

The LinkCharge platform includes the LinkCharge 20 Series and the LinkCharge CT (counter top), an out-of-box-ready infrastructure wireless charging system for use in public, enterprise and consumer settings.

More informationis at www.semtech.com/wireless-charging.