description
LTC®The 4065L is a complete constant-current/constant-voltage linear charger for single-cell Li-Ion batteries. The small form factor and the ability to accurately regulate low charge currents make the LTC4065L ideal for applications with low capacity rechargeable Li-Ion batteries. Furthermore, the LTC4065L is specifically designed to operate within USB power supply specifications.
When the charge current drops to 10% of its set value (C/10),CHRGThe pin will give an indication signal. An internal timer terminates the charging operation according to the product specifications provided by the battery manufacturer.
The LTC4065L-4.1 has a constant float voltage of 4.1V. The 4.1V version of this standard LTC4065L is intended for backup or high ambient temperature applications. Under these conditions, the reduced float voltage will be traded for increased capacity retention over the life of the battery by sacrificing initial battery capacity. Furthermore, reducing the float voltage minimizes expansion in prismatic and polymer cells.
When the input supply (AC adapter or USB power) is removed, the LTC4065L automatically enters a low current state and reduces the battery leakage current to less than 1μA. The LTC4065L can be put into shutdown mode with power applied, reducing supply current to less than 20μA.
The full-featured LTC4065L also includes automatic recharge, low battery charge regulation (trickle charging) and soft start (to limit inrush current).