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NEWSRTx Wireless Charging Chip Reaches 50W Receive Power
A new RTx chip integrates synchronous rectification, a programmable LDO, a full-bridge inverter and a 32-bit MCU, reaching 50W wireless receive power.
Sep 29, 2026 · Dangel Technology editorial
A new wireless charging RTx chip from a Chinese power semiconductor vendor combines receive and transmit functions on one die. The NU1668 targets bidirectional wireless charging designs and was identified during a recent teardown.
On the receive side the chip integrates a 27V high-efficiency synchronous rectifier that handles the AC input directly, plus a programmable low-dropout regulator with a 3.5V to 21V output range in 10mV steps. Receive power reaches up to 50W, and the integrated current sensing is specified at better than 2% accuracy.
A 10-channel, 14-bit ADC monitors voltage and current across the wireless power system to support power regulation and protection. The die also carries a 32-bit MCU that supports in-system programming, so output power, communication, protection, status reporting and fault handling can be configured per application.
In transmit mode the NU1668 uses its full-bridge inverter and PWM controller to support WPC 5W BPP operation with up to 10W of input power. Combining receive and transmit capability in one chip simplifies bidirectional wireless charging designs.
Communication and safety functions include ASK/FSK modulation and demodulation, Q-factor detection and programmable foreign-object-detection gain and offset, plus a 400kHz I2C interface for host data exchange. Protection covers input undervoltage lockout, short circuit, overvoltage, overcurrent, overpower and overtemperature. The chip ships in a 54-WCSP package measuring 4 x 2.8mm with a 0.4mm pitch.
Key points
- NU1668 pairs 50W wireless receive with reverse transmit in one chip
- 27V synchronous rectifier; programmable LDO spans 3.5-21V in 10mV steps
- 10-channel 14-bit ADC, sub-2% current sensing, 32-bit programmable MCU
- 54-WCSP package at 4 x 2.8mm, 0.4mm pitch; WPC 5W BPP transmit
Industry news compiled by Dangel Technology editorial from public reporting by Chongdiantou (charging industry media). Technical figures are reproduced as reported; verify specifications against the original source before design or procurement decisions.
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