VIN withstand voltage up to 28V Automatic identification standby current: 7uA Battery-side charging current I2C adjustable, maximum charging current: 2.2A Battery-side trickle charging current and charging cutoff current I2C adjustable Charging current temperature adjustment function, charging current automatically decreases with increasing temperature Charging termination, automatic recharging Charging float charging voltage I2C adjustable, accuracy up to ±0.5% Supports NVDC architecture, convenient for MCU power supply Synchronous boost output voltage I2C adjustable, efficiency up to 93%@0.1A Supports load insertion recognition Supports dual-channel independent discharge control Supports light load detection of load current, light load detection current adjustable Has two-level overcurrent protection function for load current Boost output thermal regulation function Discharge module overcurrent, short circuit, overvoltage, overtemperature protection Integrated LED display driver, built-in breathing light function Integrated high-speed communication interface, each channel independently controls data sending/receiving Receiving voltage feedback/current feedback mode can be freely configured, current feedback mode supports 1kbps communication rate Integrated NTC protection function

The SY8809 is a highly integrated chip designed specifically for Bluetooth earphone charging cases. The chip integrates charging and discharging modules. The charging module uses an NVDC architecture, and the battery-side charging current (I2C) is adjustable. The discharging module's output voltage (I2C) is adjustable, and it integrates two output current-limiting switches. It provides independent load presence detection and load insertion detection, and supports output current detection. The chip integrates an NTC protection function for safer battery charging and discharging.
The SY8809 integrates a standard I2C interface and interrupt signal for easy communication between the chip and the MCU, controlling charging and discharging functions.
The SY8809 integrates a communication port that enables high-speed communication from the MCU to the earphone, making it ideal for Bluetooth earphone charging case designs. Its high integration significantly simplifies the peripheral circuitry and components, providing a simple and easy-to-use solution for Bluetooth earphone charging case applications.
The SY8809 uses a QFN4x4-24 package.