INJOINIC IP6805U

IP6805U is a wireless charging transmitter control SoC, compatible with the latest WPC Qi v1.2.4 standard, supporting A11 or A11a coils with 5W charging capability. The IP6805U detects a wireless receiver via analog ping and initiates power transfer upon establishing communication with the receiver. The IP6805U decodes communication packets sent from the receiver, then applies a PID algorithm to adjust the oscillation frequency and regulate the output power on the coil. Once the battery in the receiver is fully charged, the IP6805U terminates power transfer. The IP6805U integrates a full-bridge driver circuit, full-bridge power MOSFETs, and dual-channel (voltage and current) ASK demodulation modules on-chip, achieving high integration that significantly reduces solution footprint and BOM cost. The IP6805U features two symmetric half-bridge driver modules with built-in power MOSFETs. The PWM frequency is adjustable from 110kHz to 205kHz with a minimum step as low as 0.25kHz. For USB power sources with insufficient power delivery capability, a dynamic power management (DPM) function maintains uninterrupted charging. When the system detects input voltage dropping below 4.3V, DPM activates to reduce and hold transmit power. When the input voltage recovers above 4.75V and the input current decreases by 200mA from the level at DPM entry, the system exits DPM. The built-in ASK demodulation module can independently sample coil voltage and current for ASK communication demodulation and decoding. Current decoding acquires signals via a sense resistor, which are then fed into the chip for digital demodulation and decoding. The IP6805U supports both static FOD (Foreign Object Detection) and dynamic FOD; static FOD detects foreign objects on the coil when wireless charging is not active, while dynamic FOD detects foreign objects on the coil during active wireless charging — tuning dynamic FOD requires custom firmware parameters. The IP6805U allows adjustment of static FOD sensitivity by changing the capacitor on the V_DET pin; the default configuration uses a 2.2nF capacitor to ground for standard static FOD sensitivity; a larger capacitor increases static FOD sensitivity and improves foreign object detection. The IP6805U has only 1 LED pin, supporting up to two channels. The LED indication and system status mapping for standard firmware is as follows: configuration tools can be used to modify firmware and change LED behavior; with 2 LEDs, only steady-on, steady-off, and blinking functions are supported; with only 1 LED, steady-on, steady-off, blinking, and breathing functions are all supported. When using a TI bq51020 receiver, system efficiency equals output power divided by input power. The IP6805U requires only a small number of passive components such as capacitors and resistors to implement a fully functional wireless charging solution.

• WPC v1.2.4 standard compliant
• 5W application support
• Input voltage up to 16V
• Integrated NMOS full-bridge driver and full-bridge power MOS
• Integrated internal voltage/current demodulation
• FOD foreign object detection support
• High-sensitivity static foreign object detection
• Dynamic FOD detection support
• Low quiescent power consumption and high efficiency
• Quiescent current 10mA
• Measured system charging efficiency up to 79%
• NPO and CBB capacitor compatible
• Dynamic Power Management (DPM) for USB power sources with insufficient supply capability
• Charger support down to 5V 500mA
• Input overvoltage and overcurrent protection
• Up to 2-channel LED indication support
• ESOP8 package

• Battery cases, wireless charging pads
• In-vehicle wireless charging devices