• Integrated N-channel MOSFETs with 16V Voltage Rating and Extremely Low R_DS(ON)
• High Switching Frequency to Minimize Peripheral Circuit Design
• Trickle Current / Constant Current / Constant Voltage Charging Mode
• Maximum 5A Battery Charging Current
• Maximum 3A System Current in Battery Power Supplement Mode
• USB Port Identifier for Various Input Current Limit
• Automatic Input Power Source Detection
• I²C Controls

      - Selectable Battery Charge Voltage

      - Programmable Constant Charge Current

      - Programmable Over Current Limit for SYS load

      - Programmable Battery Charging Timeout

      - Programmable Input Current DPM

      - Programmable Input Voltage DPM

• Charging Shutdown Control
• Charging Mode CV Tolerance +/-0.5%
• DO+/DO- Divider Mode Compliant
• Host Enable Control for Standby Mode
• Over Temperature Protection
• Charge Status Indication
• Light load Status Indication
• Supply Power to System by Both the Adapter and the Battery in Supplement Mode

The SY20754 is a 4.0-13.5V input voltage range, bi-directional regulator for Li-Ion battery power bank applications. It utilizes advanced bi-directional energy flow control with automatic input power source detection, enabling seamless switching between battery charging and suppling power to external devices.

When connected to an external power supply, the SY20754 operates in battery charge mode, offering comprehensive protection functions. Without an external power supply, it switches to battery power supply mode, capable of delivering an output current of up to 3A.

The SY20754 has an integrated reverse blocking MOSFET to prevent current leaking from the system or battery side to the input side and an integrated linear switch to enable overvoltage and overcurrent protection on the system side.

The device uses a half-bridge architecture with a quasi-fixed 0.5MHz switching frequency, for efficient power conversion in both battery charging and power supply modes. The half-bridge utilizes N-channel MOSFETs with a 16V rating and extremely low RDS(ON), enhancing efficiency and extending the battery life.

The small size and simple application schematic make SY20754 a good candidate for single cell battery power banks and other battery backup applications. 

The device is available in a compact QFN4x4 package.