SY20765QDC - High Efficiency, 2A, Two-cell Boost Li-Ion Battery Charger with Cell Balance Control


  • Low Profile QFN3×3 Package for Portable Applications
  • Integrated Synchronous Boost with 18V Rating Low RDSON FETs for High Charge Efficiency
  • Trickle Current / Constant Current / Constant Voltage Charge Mode
  • Programmable Input Voltage Threshold for Adaptive Current Limit.
  • Maximum 2A Constant Charge Current
  • Programmable Charge Timeout
  • Programmable Constant Charge Current
  • Selectable Constant Voltage
  • ±0.5% Battery Voltage Accuracy
  • Cell Balance Control
  • Thermal Regulation Protection
  • External Shutdown Function
  • Input Voltage UVLO and OVP
  • Over Temperature Protection
  • Output Short Circuit Protection
  • Charge Status Indication

Typical Application


SY20765 is a 3.6-5.5V input voltage rang, 2A two-cell synchronous Boost Li-Ion battery charger which integrates 1MHz switching frequency and full protection functions. The charge current up to 2A can be programmed by using the external resistor for different portable applications. It also has a programmable charge timeout and input current limit with programmable threshold for safety battery charge operation. SY20765 can disconnect output when there is output short circuit or shutdown happens. It consists of 18V rating FETs with extremely low ON resistance to achieve high charge efficiency and simple peripheral circuit design. SY20765 supports battery cell-balance function to remove voltage difference between two cells.

SY20765 along with small QFN3×3 footprint provides small PCB area application.


  • Cellular Telephones, PDA, MP3 Players, MP4 Players
  • Digital Cameras
  • Bluetooth Applications
  • PSP Game Players, NDS Game Players
  • Notebook