Electronic Design

Power: Li-Ion Charger With Micropower Comparator Fits In 3 By 3 mm

The LTC4062 standalone linear single one-cell lithium-ion (Li-ion) battery charger integrates a micropower comparator and provides features for charging safety, increased charge termination flexibility, improved status reporting, and prolonged battery life. The device requires no external sense resistor, MOSFET, or blocking diode. It can charge Li-Ion batteries to a 4.2-V float voltage with ±0.35% accuracy. For USB-powered charging, the logic pin from a USB controller can select low-power- or high-power-compliant charge currents, eliminating dependence on external discrete components. The micropower comparator has a general-purpose input and open-drain output. It can be used for low-battery detection or precision input-voltage detection. The LTC4062 is offered in a 10-lead, 3- by 3-mm DFN package. Pricing starts at $1.95 each in 1000-piece lots.

Linear Technology

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