MCP73871 Stand-Alone System Load Sharing and Li-Ion/Li-Polymer Battery Charge Management Controller Overview

The MCP73871 device is a fully integrated linear solution for system load sharing and Li-Ion/Li-Polymer battery charge management with AC-DC wall adapter and USB port power sources selection. It is also capable of autonomous power source selection between input and battery. Along with its small physical size, the low number of required external components makes the device ideally suitable for portable applications.

The main features of the MCP73871 include:

  • Integrated System Load Sharing and Battery Charge Management:
    • Simultaneously Power the System and Charge the Li-Ion Battery
    • Voltage Proportional Current Control (VPCC) Ensures System Load has Priority over Li-Ion Battery Charge Current
    • Low-Loss Power-Path Management with Ideal Diode Operation
  • Complete Linear Charge Management Controller
    • Integrated Pass Transistors
    • Integrated Current Sense
    • Integrated Reverse Discharge Protection
    • Selectable Input Power Sources: USB Port or AC-DC Wall Adapter
  • High Accuracy Preset Voltage Regulation
  • Constant-Current/Constant-Voltage Operation with Thermal Regulation
  • Maximum 1.8A Total Input Current Control
  • Resistor Programmable Fast Charge Current Control: 50 mA to 1A
  • Resistor Programmable Termination Set Point
  • Safety Timer with Timer Enable/Disable Control
  • Automatic End-of-Charge Control
  • Automatic Recharge
  • Battery Cell Temperature Monitor
  • Low Battery Status Indicator (LBO)
  • Power Good Status Indicator (PG)
  • Charge Status and Fault Condition Indicators