2-Cell Li-Ion or Li-Polymer Switching Charger Compatible with 5V Input and Integrated, Bidirectional Charge/Discharge

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The MP2639A is a highly integrated, flexible, switch-mode, battery-charging management device for 2-cell series Li-ion and Li-polymer batteries used in a wide range of portable applications.
The MP2639A is able to charge a 2-cell battery from a 5V adapter or USB input. The MP2639A can work in three modes: charge mode, discharge mode, and sleep mode. 
In 2-cell applications, the 5V input charges the 2-cell battery via the MP2639A operating in step-up mode. When the 5V input is absent, the 2-cell battery voltage is discharged to the 5V output via the MP2639A working in step-down mode.
For the charging function, the MP2639A detects the battery voltage automatically and charges the battery in three phases: trickle current, constant current, and constant voltage. Other features include charge termination and auto-recharge.
To guarantee safe operation, the MP2639A limits the die temperature to a preset value of 120°C. Other safety features include input over-voltage protection (OVP), battery over-voltage protection (OVP), thermal shutdown, battery temperature monitoring, and a programmable timer to prevent prolonged charging of a dead battery.
The MP2639A is available in a QFN-26 (4mmx4mm) package.



  • 4.0V to 5.75V Input Voltage Range
  • Charge 2-Cell Batteries with 5V Input
  • USB-Compliant Charger
  • Integrates Input Current-Based and Input Voltage-Based Power Management Functions
  • Programmable Input Current and Input Voltage Limit
  • Up to 2.5A Programmable Charge Current for 2-Cell Applications
  • 8.4V Charge Voltage with 0.5% Accuracy
  • Up to 5.0A Programmable Discharge Current
  • Negative Temperature Coefficient Pin for Temperature Monitoring
  • No Load Shutdown and Push Button Turn-On in Discharge Mode
  • Programmable Timer Back-Up Protection
  • Discharge Mode Load Trace Compensation
  • Thermal Regulation and Thermal Shutdown
  • Internal Battery Reverse Leakage Blocking
  • Integrated Short-Circuit Protection (SCP) for Both Charge and Discharge Mode
  • Four LED Battery Level and Status Indicators
  • Available in a QFN-26 (4mmx4mm) Package



    • Power Station Applications
    • Power Bank Applications for Smart Phones, Tablets, and Other Portable Devices
    • Mobile Internet Devices