BAT standby current 1uA shipmode current 300nA VIN withstand voltage 12V VIN OVP=6V, overcurrent protection 450mA Linear charging current ICH pin adjustable, charging current range 10~300mA, supports 8-level percentage adjustment Floating voltage 4.2/4.35/4.4/4.45V four-level adjustable, accuracy ±0.5% Trickle and cutoff current two-level individually adjustable Automatic recharge BAT standby current 1uA shipmode current 300nA VIN withstand voltage 12V VIN OVP=6V, overcurrent protection 450mA Linear charging current ICH pin adjustable, charging current range 10~300mA, supports 8-level percentage adjustment Floating voltage 4.2/4.35/4.4/4.45V four-level adjustable, accuracy ±0.5% Trickle and cutoff current two-level individually adjustable Automatic recharge Product reference application diagram

The SY5501 is a chip specifically designed for TWS earphones, providing a perfect solution for charging and isolated communication. The chip integrates linear charging management, discharge protection, single-wire bidirectional data communication (between the case and earphones), and an I2C communication interface, facilitating user implementation of earphone charging and discharging management and protocol communication. The SY5501's maximum charging current is externally adjustable via resistor, and it supports constant current charging (ICC) and floating voltage (VFLOAT) adjustments via I2C. The chip integrates NTC detection and protection functions for safer battery charging and discharging. The SY5501 features battery discharge protection and ship mode functionality, enabling low-power consumption in the earphone system. The chip integrates proprietary control instructions; the earphone charging case can send instructions to the SY5501 via VIN to control the power on/off and reset of the earphone main control. The SY5501 also supports intelligent identification of in-case/out-of-case status and actively notifies the earphone main control. The SY5501 is feature-rich and low-power, shortening the Bluetooth earphone development cycle. Its compact QFN14-1.6mm x 1.6mm package saves significant space in Bluetooth earphone designs.