MC34674,pdf datasheet (Single-

The MC34674 is a fully integrated single-cell Li-Ion and Li-Polymer battery charger optimized for travel charger applications. The few external components required include a dual-color LED for charge-status indication, a negative temperature coefficient (NTC) thermistor circuit for setting the charge temperature window, and two decoupling capacitors. The high input voltage, up to 28 V, allows low-cost AC/DC converters to be used for further system cost reduction. A typical charge cycle of the MC34674 includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC-mode current is selectable from 50 mA to 1.05 A with 8% accuracy and the constant-output voltage in the CV-mode is fixed at 4.2 V with 0.4% accuracy over -20°C to 70°C temperature range.