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Linear Li-ion battery charger operates from any adapter

Posted: 13 Aug 2003 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? wall charger? battery charger? li-ion battery?

Linear Technology Corp. has introduced the LTC4002, a standalone switch-mode Li-ion battery charger with an operating supply up to 24V, eliminating the need for input transient protection required with 9V and higher wall adapters. The IC's low dropout operation and 4.7V input supply guarantees continuous charging of 4.2V Li-ion batteries from any 5V wall adapter. For safety and autonomous charge control, the device includes features such as automatic shutdown, battery preconditioning, battery temperature sensing, end-of-charge indicator, and a 3-hour charge termination timer.

The LTC4002's constant 500kHz operating frequency and current mode architecture allow smaller inductor and capacitors when compared to hysteretic topology chargers. With low 100mV sense voltage, >86 percent is easily attained by the device. The standalone charger is offered in 3mm-by-3mm DFN and 8-lead SO packages with temperature rating from -40C to 80C.

The device is priced at $1.95 each in 1,000-unit quantities.

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