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Wireless charger modules enable use in smaller devices

New Products |
By Rich Pell


The BP3621 (transmitter) and the BP3622 (receiver) wireless charging modules allow designers to add wireless power supply functionality to smaller devices such as smart tags/cards or PC peripherals. Measuring just 20mm2 to 30mm2 each, the modules incorporate an optimized antenna (coil) layout that enables configuration of a compact wireless charging system using the 13.56MHz frequency band to deliver up to 200mW.

The full-flat backside board structure facilitates mounting in thin, compact devices – contributing to greater flexibility in chassis design in contrast to conventional solutions. Moreover, says the company, using the transmitter and receiver modules as a pair can significantly reduce the development load for prototyping, adjustment, evaluation, and other processes necessary to achieve high efficiency wireless charging. At the same time, the built-in antenna supports bi-directional data communication and NFC Forum Type 3 Tag operation, expanding applicability.

The modules are designed to address issues with existing low frequency standards for power transmission, which, coupled with restrictive antenna designs, limit the degree of miniaturization that can be achieved. These limiting factors, says the company, are accelerating the demand for standards and methods that can be universally adopted in compact devices.

In addition, the power transmission efficiency can vary – depending on the antenna shape, size, and distance. Therefore, it is often necessary to repeat prototyping, adjustment, and evaluation on the system – representing a large development burden for antenna design and layout.

The modules are available now. Sample pricing is $36.6/unit.

Rohm Semiconductor


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