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Semtech ICs have 6h programmable charge timer

Posted: 12 Apr 2004 ?? ?Print Version ?Bookmark and Share

Keywords:semtech? sc802? battery charger ic?

Semtech Corp. has launched its SC802 series of Li-ion/Lithium-polymer battery charger ICs that feature a 6h programmable charge timer and thermistor voltage input sensor to allow designers to program in redundant charge termination functions.

"Portable designers are looking at all aspects of their power systems to improve safety, and they increasingly want charge termination redundancy built into their products to ensure that overcharging isn't the cause of battery safety issues," said Eddie Yeow, VP of Semtech's Portable Products Group. "With the SC802, we give designers two types of redundancy without sacrificing the small size and strong features for which Semtech battery charging solutions are known."

Designers can program the SC802 charger to automatically terminate charging after any length of time, up to six hours. The IC's thermistor input sensor can read voltage changes that indicate changing thermal conditions and can terminate charging when these conditions are outside programmed ranges.

The chargers also automatically detect the voltage levels in a battery and will initiate either a pre-charge current for deeply discharged batteries with less than 2.8V of power, or fast-charge current for batteries with power levels higher than 2.8V. Once a battery reaches 70 percent of capacity, the current is reduced while the voltage remains constant until the battery is fully charged. Once charging is complete, the SC802 goes into a maintenance mode to ensure that the battery remains at full capacity while a charging adapter is connected.

The SC802 features a 14V input voltage range that eliminates additional protection circuitry required by other 5V chargers in the event of faulty adapters. It also provides an LDO mode that can be used to power the device directly from the power adapter when the battery is removed.

Available in an optional, lead-free 4-by-4mm (0.9mm height) MLP, the SC802 chargers are suitable for cellphones, smart phones, charger stations and PDAs. The SC802IMLTR (standard MLP4x4-16 package), SC802IMLTRT (lead-free MLP4x4-16 package) and SC802AIMLTRT (lead-free MLP4x4-16 package) are priced at $1.37, $1.37 and $1.39 each.

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