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MWCT1200CFM

MWCT1200CFM - 5W Multi-Coil Wireless Charging Tx IC | NXP

The NXP Semiconductors MWCT1200CFM is a 5 W multi-coil wireless charging transmitter IC integrating a full Qi-compliant A5/A11 controller, FSK/ASK modulation demodulation, and foreign object detection (FOD) in a 32-pin HVQFN (5x5 mm) package. The device operates from a 2.7 V to 3.6 V supply and draws 300 µA of supply current, making it suitable for 5 V input wireless-charging-pad designs based on the WPC medium-power specification. What is a wireless charging transmitter IC? A wireless charging transmitter IC (PMIC) is a specialized power management unit that drives a transmitter coil to deliver energy to a Qi-compliant receiver through resonant inductive coupling. The transmitter sits inside the category hierarchy: PMIC -> power management IC -> wireless power transmitter -> semiconductor. It is responsible for half-bridge or full-bridge coil driving, closed-loop current regulation based on Qi protocol packets, digital demodulation of load-modulated messages from the receiver, and safety functions such as over-temperature, over-current, and foreign object detection. Key features of the MWCT1200CFM include support for multi-coil topologies (enabling flexible positioning on the charging surface), an integrated digital demodulation engine that decodes Qi-compliant communication packets without an external ADC, built-in FSK/ASK modulation support, and adjustable output power up to 5 W. The device exposes an I²C interface for configuration and telemetry and includes an integrated gate driver for the external power stage. Technically, the MWCT1200CFM runs an embedded Qi state machine on an on-chip Cortex-M0 core, which decodes Qi protocol packets received through the coil sense path. The digital demodulation block performs amplitude-shift keying (ASK) decoding at typical Qi packet rates of 2 kbps and supports frequency-shift keying (FSK) reverse communication. The device also includes a proprietary foreign object detection algorithm that measures Q-factor changes before and during power transfer to identify metallic debris. Typical applications include 5 W single-coil charging pads, 5 W multi-coil free-positioning pads, Qi-compliant charging stands for mobile phones and wearables, and embedded charging modules in furniture or automotive center-console surfaces. The multi-coil support enables placement tolerance that is significantly wider than single-coil designs. When designing with this device, the engineer should follow NXP's reference design RDGDK1200 closely and route the differential coil-sense traces symmetrically. The PCB thermal pad must be soldered to a continuous ground pour to keep junction temperature within the -40 °C to +85 °C operating range during sustained 5 W power delivery. This page synthesizes distributor pricing, drop-in alternative availability, and practical design notes not found in the manufacturer datasheet alone.