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Linear Technology introduces the LTC4075 and LTC4075X, standalone dual-input linear battery chargers that manage charging single-cell Li-Ion batteries from two separate power sources: a wall adapter and USB. Using a constant-current/constant-voltage algorithm, the chargers can deliver up to 950 mA of charge current from a wall adapter supply, or up to 500 mA of charge current from a USB supply while automatically sensing the presence of voltage at each input. The final float voltage accuracy is ± 0.6% in either case. The LTC4075X disables the trickle charge function, benefiting systems requiring more charge current during low battery conditions. Applications include PDAs, MP3 players, lightweight portable medical and test equipment and large color screen cell phones. The LTC4075/X is equipped with a thermal regulation scheme, which maximizes the charging rate without the risk of overheating. The device is flexible as each of the following is programmable via a single resistor: wall adapter supply charge current, USB supply charge current and charge termination current. As a standalone charger, it also features trickle charge for battery pre-conditioning, undervoltage lockout, automatic recharge, a charge status indicator and "power present" status outputs to indicate the presence of wall adapter or USB power. The LTC4075/X is offered in a low profile (0.75 mm) 10-lead 3 × 3 mm DFN package. The total solution footprint is less than 25 mm² since no external MOSFET, sense resistor or blocking diode are required. To preserve battery energy, the LTC4075 draws < 6 uA from the battery terminal in standby and < 2 uA in shutdown mode. The LTC4075/X is rated for operation from – 40° C to 85° C.
Linear Technology Corporation

Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA, 95035