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 chargestatus indication, a negative temperature coefficient (NTC) thermistor circuit for setting the charge temperature window, and two decoupling capacitors. The high input voltage, up to 28V, 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 50mA to 1.05A with 8% accuracy and the constantoutput voltage in the CV-mode is fixed at 4.2V with 0.4% accuracy over -20C to 70C temperature range. The MC34674 has all the features such as trickle charging for a deeply discharged battery, an internal timer for termination to prevent charging a failed battery, charger current thermal foldback for thermal protection, and smart battery connection verification to prevent charging in case there is no battery connected. It also protects the system with its input over-voltage protection (OVP) feature. In addition, it has a 2.6V falling power-on-reset (POR) threshold, making it perfect to work with current limited power supplies. When the charger is disabled, the BAT pin leaks less than 1A current from the battery. All the above functions are fit into a small 8-lead 2X3 UDFN package. Features