Member #665881

Member Since: March 26, 2015

Country: United States

  • Which version of MCP73831 is used on this product? And is the same part always used? From a previous comment, I see it is a 4.2v version, but there are also 3 different versions with varying preconditioning currents and thresholds, and termination currents. With MCP73831 chips marked KDxx (MCP73831T-2AC), if the battery is below 2.79v, it will charge the battery at 10% of the charge current (50ma, if the resistor is not changed) until the voltage reaches 2.79v, then charge at the chosen current (500mA) until the voltage reaches 4.2v, then hold at 4.2v until the charging current decreases to 7.5% of the charge current (37.5mA). Then it stops charging, until the voltage drops to 96.5% (4.05v), at which point it will charge again. With chips marked KExx (MCP73831T-2AT), if the battery is below 3.00v, it will charge the battery at 10% of the charge current (50ma) until the voltage reaches 3.00v, then charge at the chosen current (500mA) until the voltage reaches 4.2v, then hold at 4.2v until the charging current decreases to 20% of the charge current (100mA). Then it stops charging, until the voltage drops to 94% (3.95v), at which point it will charge again. With chips marked KFxx (MCP73831T-2DC), there is no preconditioning charge; it just starts charging at the chosen current (500mA) until the voltage reaches 4.2v, then holds at 4.2v until the charging current decreases to 7.5% of the charge current (37.5mA). Then it stops charging, until the voltage drops to 96.5% (4.05v), at which point it will charge again.

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