SY20741BQDC - High Efficiency, 2.5A, Multi-Cell Li-Ion Battery Charger


  • Integrated Synchronous Buck and Reverse Blocking FET with 16V Rating
  • Adaptive  Input Power Limit for 4-14V Wide Input Voltage
  • Maximum 2.5A Programmable Charge Current
  • 4.1V and 4.246V Constant Voltage Selectable
  • Support Single-cell or Two-cell Battery Pack
  • External Shutdown Function
  • Input Voltage UVLO and OVP
  • Thermal Fold-back Protection
  • Over Temperature Protection
  • Battery Short  Protection
  • Programmable Charge Timeout
  • Charge Status Indication
  • Low Profile QFN3×3 Package for Portable

Typical Application


SY20741B is a 4-14V input, 2.5A multi-cell Li-Ion battery step-down charger. The charge current up to 2.5A can be programmed by using the external resistor for different portable applications. It also has a programmable charge timeout and adaptive input power limit for safety battery charge operation. It consists of 16V rating reverse blocking FET and power switching FETs with extremely low ON resistance to achieve high charge efficiency and simple peripheral circuit design.
SY20741B along with small QFN3×3 footprint provides small PCB area application.


  • Power Bank
  • Cellular Telephones, PDA, MP3 Players, MP4 Players
  • PSP Game Players, NDS Game Players
  • Notebook