Power Electronics

Miniature Battery Charger ICs

The SC802 series of Lithium-ion/Lithium-polymer battery charger ICs from Semtech Corp. features a 6-hr programmable charge timer and thermistor voltage input sensor to allow designers to program in redundant charge termination functions to protect portable products from faulty batteries. Portable product 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 SC802 chargers automatically detect the voltage levels in a battery and will initiate either a precharge current for deeply discharged batteries with less than 2.8 V of power, or fast-charge current for batteries with power levels higher than 2.8 V. Once a battery reaches 70% of capacity, the current is reduced while the voltage remains constant until the battery is fully charged. When charging is complete, the SC802 goes into a maintenance mode to ensure the battery remains at full capacity while a charging adapter is connected.

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

The SC802 is available in an optional, lead-free 4-mm × 4-mm footprint, 0.9-mm height micro-leaded package (MLP) that is suitable for use in cell phones, smart phones, charger stations and personal digital assistants.

For more information, visit www.semtech.com.

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