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5W wireless power receivers cut power loss by half

Posted: 28 May 2014 ?? ?Print Version ?Bookmark and Share

Keywords:wireless? power receiver? Qi?

Texas Instruments has unveiled two compact 5W wireless power receivers that support the Wireless Power Consortium Qi 1.1 standard, facilitating more efficient charging of Qi-compliant devices.

The single-chip receiversbq51020 and bq51021feature a programmable output voltage up to 8V and low on-resistance MOSFETs to reduce power loss by as much as 50 per cent. They boast 96 per cent power efficiency, and 35 per cent temperature rise reduction.

The bq51021 model features an I2C interface, which allows system designers to implement foreign object detection and a "pad-detect" feature that promises better user experience with a more easier manner of aligning the receiver with the charger.

The receivers are compact, achieving a solution size of 75mm2 without the need for an inductor.


Simplified schematic of the bq5102x devices.

The two receivers join the previous bq51221 devices, which TI introduced in February and are claimed as the first dual-mode 5W wireless power receivers to support Qi and the Power Matters Alliance (PMA) specifications. In addition, the company also recently released the bq51003 2.5W receiver for small portable and wearable applications. The devices come with separate evaluation modules.

All wireless power receivers are available in volume production through TI and its worldwide network of authorised distributors. All three receivers come in a 42-ball, 3.6mmx2.9mmx0.5mm chip scale package at $2.50 for the bq51020, $2.70 for the bq51021 and $3.00 each for the bq51221 in 1,000-unit quantities. The low-power bq51003 receiver comes in a 28-ball, 1.9mmx3.0mm chip scale package at $1.30 each in 1,000-unit quantities.

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