SY20718EQDC - High Efficiency Bi-direction Power Bank Regulator for Single-cell Battery Power Bank


  • Maximum 18V Input Voltage Surge
  • Bad Adapter Detection
  • Build in Power Path NFETs and Power Switches
  • 500kHz Switching Frequency Operation
  • Trickle Current / Constant Current / Constant Voltage Charge Mode with Internal Compensation
  • Maximum 2A Constant Charge Current
  • Maximum 2.5A Boost Output Current
  • 4.25V/4.4V Selectable Battery Cell Voltage
  • +/-0.5% Cell Voltage Accuracy
  • Charge/Discharge/Fault Status Indicator
  • Discharging Control Logic
  • Programmable Input Current Limit
  • Dynamic Power Management
  • Cycle-by-cycle Peak Current Limitation
  • Input Voltage UVLO and OVP
  • Boost Output Short Circuit Protection
  • Thermal Shutdown

Typical Application


The SY20718E is a 5V adapter input with up to 18V surge bi-directional regulator which is designed for single cell Li-Ion battery power bank application. Advanced bi-directional energy flow control with automatic input power source detection is adopted to achieve battery charging mode and battery power supply mode alternately. 
The SY20718E also integrates the discharging enable/disable control and LED status indication.  
The SY20718E is available in QFN3x3 package to minimize the PCB layout size for wide portable applications.


  • Single Cell Power Bank
  • Portable Device with Single Cell Battery