Improved efficiency in a dual-mode Qi, PMA wireless power receiver

March 05, 2014 // By Graham Prophet
TI says it has the first dual-mode 5-W wireless-charging power solution to ship in volume production; a product that reduces power loss by 50%, enabling faster, more efficient charging

Texas Instruments’ bq51221 dual-mode wireless power receiver supports both the Wireless Power Consortium's (WPC) Qi 1.1 and Power Matters Alliance (PMA) specifications. The bq51221 inductor-less, 5-W receiver's high efficiency and programmable output reduces power loss by as much as 50 % compared to existing receiver solutions, allowing consumers to more efficiently and quickly charge their mobile phones, headsets and power banks from a Qi or PMA charging station.

The device features up to 96% power efficiency, and its adjustable output voltage helps reduce power loss. The 3.6 by 2.9 by 0.5-mm single-chip wireless power receiver achieves a solution size of 75 mm 2 without the need for an inductor.

In addition to the dual-mode receiver, TI has also introduced its bq51010B next-generation Qi 1.1-compliant receiver with an integrated 7-V regulated supply and foreign object detection. The single-chip receiver 93% power efficiency and ensures the lowest possible power dissipation when charging a Qi-compliant smartphone.

The bq51221 dual-mode receiver comes in a 42-pin, 3.6 by 2.9 by 0.5-mm package at $3.00 (1000): Qi-only versions of the bq51221 are expected to be available in the second quarter OF 2014. Designers can order the bq51221EVM-520 evaluation module to get started on dual-mode wireless power receiver designs. The bq51010B comes in a 28-pin, 1.9 by 3-mm BGA package at $2.50 (1000).

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