MP2639A 4-5.75V 2-Cell Li-Ion or Li-Polymer Switching Charger Compatible QFN-26

MP2639A 4-5.75V 2-Cell Li-Ion or Li-Polymer Switching Charger Compatible QFN-26

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.

Key Specifications

Features

• 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
• Cell Balance with 200mA current
• Up to 5.0A Programmable Discharge Current
• Negative Temperature Coefficient Pin for Temperature Monitoring

Typical Application Circuit

Applications

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

Design Notes

• Charge current accuracy depends on the sense resistor tolerance, so use a 1% or better part and keep its traces Kelvin-connected.
• Wire the NTC input for JEITA profile control if the pack is charged over temperature.
• Set the input current limit to what the adapter can actually deliver; a limit above the adapter rating causes the input rail to collapse mid-charge.
• Termination current and recharge threshold dominate cycle life in shallow-cycling products.

Common Questions