20 Watt Wireless Charging IC Provides a High Efficiency Solution for Mobiles

NuVolta Technologies have developed a 20 W wireless power receiver IC based on its high efficiency Controlled Resonance wireless power architecture. The NU2500 power management IC can cover wireless power applications from 0.5 W to 20 W. In combination with the company’s transmitter IC NU1000, NuVolta provides efficient and fast wireless charging solutions for smart watches, smart phones, tablets and notebook computers.

They claim that a typical 6.78 MHz system with NU2500 can reach over 85% efficiency at 12 V, with 15 Watts of output power with a simple and thin receiver coil, making it significantly better than many existing wireless power solutions. Their magnetic resonance solutions are also compatible with metal cases and metal back covers, giving system developers more freedom to enrich the charging experience.

NU2500 is a power management IC integrating all key functional blocks to implement proprietary controlled magnetic resonance architecture in a power receiver, including Power MOSFETs, gate drivers, current sensing, control circuit, and I2C interface. It is available in 5 mm x 5 mm QFN or 3.4 mm x 3.6 mm BGA package, and can support an input voltage between 4.5 V to 22 V. This IC can be used for a wide range of applications, ranging from wearable devices with a fraction of a Watt to smart phones and laptop computers with tens of Watts.

With simple TX and RX coils from 6.78 MHz as well as simple application circuit enabled by novel controlled resonance architecture, their wireless charging solutions realize easy and flexible user charging experience promised by magnetic resonance technology for years, at a system efficiency and cost far better than other technologies. It also reaches a system efficiency unseen in a practical design in mobile devices.