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Battery charger plays down power dissipation

Posted: 01 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? power dissipation? Li-ion NiMH NiCd?

Linear Technology Corp. introduces the LTC4009, a fast-charge 4A capable, high efficiency switchmode battery charger controller for multiple battery chemistries, which minimizes power dissipation without compromising board space. The LTC4009 supports Li-ion/polymer, NiMH, NiCd and sealed lead acid battery chemistries in multicell configurations. AC adapter current limiting maximizes the charge rate for a given fixed input power level, allowing the product to operate at the same time the battery is charging without complex load management algorithms. The IC operates from input voltages up to 28V and is intended for applications including portable computers, portable instruments, and battery backup systems.

The LTC4009's synchronously rectified, buck switching topology drives all N-channel MOSFETs and enables efficiencies as high as 90 percent at 4A. Final float voltage accuracy is specified at 0.5 percent and charge current is programmable with accuracy of 4 percent. The LTC4009's quasi-constant frequency PWM architecture guarantees no audible noise operation and minimizes filtering needs while the high operating frequency of 550kHz allows the use of small inductors and capacitors. Improved non-overlap control keeps efficiency high as external power FET turn on/off times may vary with temperature and supplier. The LTC4009 consumes The LTC4009 is housed in a compact 20-lead, low profile (0.75mm) 4mm x 4mm QFN package. It is guaranteed for operation from 0C to 85C ambient temperature. Pricing starts at $2.95 each in 1,000-piece quantities.

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