Linear Technology Corporation introduces the LTC4054

To eliminate the risk of overheating, the LTC4054 incorporates thermal feedback regulation by automatically controlling the charge current to limit the die temperature during high power operation or high ambient temperature. The LTC4054 keeps the battery 揻resh?after charge termination by monitoring the battery抯 voltage and automatically recharging it if the voltage drops below a set threshold. Because of its standalone operation, compact solution and low 4.25V input supply operation, the LTC4054 is an ideal solution for charging a Li-Ion battery from the USB port in handhelds as well as Bluetooth?headsets, portable MP3 players, battery powered GPS devices, PDAs and cell phones.

The LTC4054 is a linear charger for single-cell 4.2V Li-ion and Li-Polymer batteries. The IC charges the battery in constant-current/constant-voltage mode and terminates charging after detecting C/10. The termination event is indicated by a Charge Status pin, which can signal a microcontroller or drive an LED. The user sets the charge current with a resistor. The float voltage is preset at 4.2V with