VIN-side DC withstand voltage up to 28V HALL switch box standby current: 2.5uA Charging current can be adjusted by external resistor Maximum linear charging current: 1A Charging current temperature adjustment function, charging current automatically decreases with increasing temperature C/10 charging termination, automatic recharging 4.2V/4.35V charging float voltage, accuracy up to ±1% Integrated overvoltage protection during charging Synchronous boost output 5.05V, efficiency up to 93%@0.1A Supports load insertion detection Supports light load current detection, light load detection current 3mA Has two-level overcurrent protection function for load current Supports 5.05V constant output Boost output thermal regulation function Discharge module overcurrent, short circuit, overvoltage, overtemperature protection Special event unidirectional communication instruction VIN-side OCP protection function 1-4 LED display, external automatic recognition Integrated button function: battery level display & communication instruction Supports direct driving of HALL chip, charging compartment automatically starts discharging when closed, and earphones automatically power on and reconnect when opened

The SY8811 is a chip specifically designed for Bluetooth earphone charging cases. The chip integrates charging and discharging modules. The charging current is externally adjustable; the discharging module integrates two output current limiting switches, providing independent load presence detection and load insertion detection, while also supporting output current detection. The chip integrates an NTC protection function for safer battery charging and discharging.
The SY8811 integrates unidirectional communication instructions, facilitating the reporting of the charging case status to the earphone main control unit during special event triggers. This chip also features VIN OCP protection, saving the need for external OCP protection devices; the SY8811 is ideal for Bluetooth earphone charging case designs, greatly simplifying the peripheral circuitry and components, and providing a simple and easy-to-use solution for Bluetooth earphone charging case applications.
The SY8811 uses a 3mm*3mm QFN16 package.