NXP Semiconductors’ new NXQ1TXH5 is a controller and driver transmitter IC for a 5V Qi-compliant low-power wireless charger.
It offers a fully integrated solution which includes a 5V full-bridge power stage as defined in the Qi standards A5, A11, A12 and A16 specified by the Wireless Power Consortium (WPC).
The 5mm x 5mm NXQ1TXH5 uses analogue ping circuitry to detect Qi receiver devices. This detection circuit uses very little power in the wait state: the chip’s stand-by power consumption is typically just 10mW.
After a Qi-compliant receiver is recognised, the NXQ1TXH5 safely initiates wireless power transfer from the transmitter to the receiver, while monitoring for fault conditions such as overheating or interference from metal objects by supporting the Foreign Object Detection (FOD) function.
The NXQ1TXH5 is best operated from a 5V USB power supply, and automatically adjusts the output power to compensate for power-constrained supplies.
LED outputs and a buzzer output are available for the user interface. The LED outputs feature a number of blinking modes. Multiple NXQ1TXH5-based transmitters may operate from a single USB power supply, since the devices are able to limit the power consumed by each device.
- Up to 8W Transmit power
- Over-current protection
- Over-temperature protection
- Exceeds EN55022 specifications for radiated and conducted emissions
- Very few external components required
- Integrated coil current measurement
- Dual-channel ASK communication with receiver
- Wireless Power Consortium (WPC) Qi wireless power transmitters
- 1-3W wireless charging for wearable devices, remote controls, toys, medical tools and small home appliances