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Li-ion battery charger delivers up to 2A

Posted: 03 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LTC4001? battery charger? Linear Technology? switch mode?

Linear Technology Corp. introduced the LTC4001, a 2A capable, switch mode battery charger for single-cell, 4.2V Li-ion/Li-polymer batteries that is said to minimize heat dissipation without compromising board space.

The LTC4001 includes features such as automatic shutdown, battery preconditioning, a thermistor input for temperature-qualified charging, remote sensing, end-of-charge indication and a programmable charge termination timer. The device is intended for 5V wall adapter input power and is suited for applications including handheld medical devices, handheld computers, charging docks and cradles, digital cameras and smart phones. It may also be used with current limited wall adapters to reduce power dissipation.

The product's synchronously-rectified, buck switching topology enables efficiencies as high as 90 percent at 1.5A, said the company. Final float voltage accuracy is specified at 1 percent with charge current accuracy of 10 percent. The LTC4001's high operating frequency of 1.5MHz and current mode architecture allow the use of small inductors and capacitors. The charger automatically enters sleep mode, dropping the battery drain current to 5A and increasing battery run time.

The LTC4001 is housed in a compact 16-lead, low-profile (0.75mm) 4-by-4mm QFN package. It is guaranteed for operation from -40C to 85C. Pricing starts at $2.20 each in 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC4001 2A Synchronous Buck Li-Ion Charger ICs, Interface



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