Standalone Li-Ion battery charger

7 May 2003 Power Electronics / Power Management Access Control & Identity Management Products & Solutions

Linear Technology's LTC4056, is a linear Li-Ion battery charger controller is designed to provide a microcontroller-free solution, as well as faster charging from a poorly regulated or a sagging input supply such as a wall adapter or USB port. The total solution occupies an area of less than 75 mm² and has a height of only 1 mm. Whereas traditional ICs inhibit charging or pull down on an input power supply when the input voltage source sags, the LTC4056 continues charging the battery by limiting the charge current until the input power source recovers. As a result, uninterrupted battery charging reduces the charging time. The IC also includes all the necessary functions for charging, charge termination and protection. The device targets systems that need to charge a 4,2 V Li-Ion battery from a 4,5 to 6,5 V input source with charge currents ranging from 200 to 700 mA. The user can easily adjust the charge current and charge termination time with an off-the-shelf resistor and capacitor, respectively. Precision 1-cell Li-Ion battery charging is guaranteed with the LTC4056's preset 4,2 V ±0,5% accurate float voltage. The LTC4056 also features automatic recharge, charge conditioning, status output signal, and AC adapter detection.

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