Battery Charger with SmartStart

Linear Technology’s LTC 4062 standalone, linear, single one-cell, lithium-ion battery charger offers advanced features for charging safely, increased charge temination flexibility, improved status reporting and prolonged battery life.

The charger has an adjustable timer for charge termination and a precision float voltage to prevent over-charging of the cell. The LTC 4062 includes an integrated precision, micropower comparator, which is an undedicated comparator with a general purpose input and open-drain output. The device can charge lithium-ion batteries to a 4.2V float voltage with ±0.35% accuracy. It also does not require an external sense resistor, MOSFET or blocking diode, thereby simplifying design. At any point in the charge cycle, the new battery charger can be shut down, limiting battery current drain to less than 2µA.

The LTC4062 prolongs battery life by eliminating unnecessary re-charge cycles with its SmartStart feature, which prevents a new charge cycle from starting if the battery voltage is above 4.1V.

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