With the appearance of large amount of smartphones, tablets, laptops and players on the market of modern electronic devices the demand in supplying of power towards such equipment without a direct connection through a wire and source has occurred. As known, the consumer's demand in the field of telecommunications is mainly due to both improved features and an expanded interface, as well as the ability to use all the functionality of mobile devices without time limits. In modern mobile devices more functions appear every year. At the same time, their energy consumption is growing. This fact leads to the frequent using of a charger. In this regard, the production of wireless chargers and their accessory equipment is one of the most urgent tasks facing developers of leading companies manufacturing new generation gadgets, as well as WPC (Wireless Power Consortium), consisting of more than 100 different companies, and other organizations which carry out active work in standardizing of wireless energy transmitters.

Not long ago TDK represented one of their latest achievements in their field of activity on the Russian market - inductors applied in wireless chargers installed in modern smartphones and other mobile devices. The thickness of some coils does not exceed 0.57 mm.

The TDK's success in the field of soft magnetic materials development and technological processes improvement led to the creation of unique ultra-thin and flexible magnetic sheets. Applied approaches have led to the creation of coils that are not only ultra thin and ultra lightweight. Such elements also have a high resistance to various types of mechanical stresses, providing durability and increased reliability. Moreover, despite the small thickness of the profile, the coil design minimizes the tendency to increase resistance and allows you to achieve a specified value of the power transfer coefficient, meeting at the same time all the Qi standards , designed especially for transferring of energy to various devices by means of magnetic induction.

Standard Tx coil units for wireless power charging (WPC) corresponding Qi standard

TDK ordering code	WT-525225-20K2-A1-G	WT-505090-20K2-A10-G	WT-505090-10K2-A11-G	WT-1005690-12K2-A6-G
WPC compliant Tx type	WPC A1, A9	WPC A10	WPC A11	WPC A6
Input voltage	A1 (19V); A9 (12V)	A10 (19V)	A11 (5V)	A6 (12V)
Ferrite type	Solid	Flexible	Flexible	Flexible
Sheet size, mm	52 х 52	Ø50	Ø50	100 x 56
Coil turns	10 ts х 2 layers=20 ts	10 ts х 2 layers=20 ts	10 ts х 1 layers	12 ts х 1layers, 3 coils
Thickness of coil + sheet (mm) typ.	4,63	3,13	2,08	2,53
Coil outer size (mm) typ.	Ø43	Ø43	Ø43	53.2 x 45.2
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