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Li-ion battery linear charger IC

Torex has unveiled the XC6802 series of linear charger ICs for single cell lithium-ion batteries. The series includes a reference voltage source, battery voltage monitor, driver transistor, constant-current/constant-voltage charge circuit, over heat protection circuit and phase compensation circuit. The battery charge termination voltage is internally set to 4.2V ±0.7% and the trickle charge voltage and accuracy is 2.9V ±3%. In a typical application circuit, when the BAT pin voltage rises above 2.9V, the charger enters into CC (constant-current) mode and the battery is charged by the programmed current charge. When the BAT pin voltage reaches 4.2V, the charger enters CV (constant-voltage) mode automatically. After this, the charge current drops to one tenth of the programmed charge current and the charge terminates. The charge status output pin/CHG pin is capable of checking the device’s charging state while connected to an external LED. With an external resistor between the ISEN pin and the VSS pin, the charge current can be set anywhere up to a maximum of 800mA. This flexibility makes the series suitable for a wide variety of battery charge applications.