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NXP intros 5V wireless charging transmitter reference design

Posted: 18 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:NXP Semiconductors? wireless charging? transmitter? reference design? Qi?

NXP Semiconductors N.V. has released what it describes as a highly optimised reference design for 5V low power Qi wireless charging transmitters. Compliant with the Wireless Power Consortium (WPC) 1.1 Qi specification, the design is based on NXPs single-chip 5V wireless power transmitter IC.

The NXQ1TXA5 that was launched in 2014. It is the latest addition to NXP's line-up of Greenchip power solutions.

The NXQ1TXA5 reference design claims to have an exceptional standby power consumption of less than 10mW. It is the only solution on the market today that meets 5-star mobile phone charger standby power ratings by consuming less than 30mW in standby mode, which includes the standby power of the wall-charger, stated the company. NXP recommends combining its NXQ1TXA5 ultra low standby power wireless power transmitter solution with another Greenchip device, its TEA1720 SMPS IC with a standby power of less than 20mW.

The NXQ1TXA5 device combines: NXP's patented high-efficiency Class D amplifier technology for outstanding EMI performance; NXP's ultra low-power CoolFlux DSP technology for superior communication with smartphones placed on the charger; and a dedicated low power mixed signal circuitry to check for smartphone presence three times per second, enabling fast start up of charging, while keeping the standby power very low if there is no smartphone on the charger, detailed the company.

Due to the low power consumption of the NXQ1TXA5 device itself, the reference design also has a high efficiency for low transmitted powers, making it suitable for applications ranging from smartphone charging to deliver 5W to the smartphone battery when used with a Qi compliant wireless charging receiver, to chargers for wearables that need less than 2W charging power.

The NXQ1TXA5 reference design needs only 15 to 20 low cost passive components and uses a standard 2-layer PCB, with the components mounted on a single side. Depending on customer requirements, the complete application can be designed on a board space as small as 3cm x 3cm or 4cm x 4cm.

The NXQ1TXA5 wireless charging transmitter reference design will be available in Q2.





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