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SC810 Li-ion Battery Charger - Key Features & Operation

️· Charging Algorithm: Implements a Constant Current (CC), Constant Voltage (CV), Constant Temperature (CT) charging algorithm.
️· Charging Stages:
- Pre-charge: Starts if battery voltage is low (<2.8V), provides 20% of the programmed fast-charge current to condition the battery.
- Fast-charge (CC): Delivers constant current until the battery reaches approximately 4.2V. The current is programmed using a resistor (IPRGM) connected to ground.
- Constant Voltage (CV): Maintains a constant voltage (4.2V) as the battery charges, with the current decreasing.
️· Charge Termination: Charging stops when the current drops below 10% of the programmed fast-charge current.
️· Optional Modes:
- Float Charging: Continuously regulates voltage after termination.
- Monitor State: Turns off output after termination, re-enabling when the battery voltage drops below a threshold.
️· Programming: The fast-charge current is programmed by a resistor between the IPRGM pin and ground. The document provides charts showing how to select the proper resistance.
️· Protection: The charger features glitch filtering on the VIN pin and undervoltage lockout.
️· Key Specifications:
- Pre-charge current: 20% of fast charge current
- Termination current: 10% of fast charge current
- CV regulation voltage: 4.2V

In essence, the SC810 is a complete single-cell Li-ion battery charger with programmable current, various operating modes, and built-in protection features. The datasheet provides details on selecting the proper programming resistor to achieve the desired fast-charge current.