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Li-ion battery chargers target portables

Posted: 26 Nov 2008     Print Version  Bookmark and Share

Keywords:linear charge  integrated FETs  battery chargers  power path management 

Texas Instruments Inc. has announced the availability of four 28-V, 1.5-A linear charge management ICs with integrated FETs aimed at smart phones and other portable electronics.

The bq2407x family of lithium-ion (Li-Ion) battery chargers allows an end-equipment to be powered directly from an external power source, even if the unit's battery pack is defective, fully discharged or absent.

The new bq24072, bq24073, bq24074 and bq24075 chargers integrate a high number of features in a 3 mm x 3 mm QFN, claims TI. The chargers incorporate a 28-V, 1.5-A input FET, a 5-A battery FET, current sensor, reverse blocking protection, thermal regulation and other battery management features. The devices support up to 1.5-A in charging mode and up to 5-A in discharge mode, which allows them to support higher currents from RF power amplifiers, such as those found in a GSM application.

The four bq2407x chargers also provide a unique power path management feature to simultaneously charge the battery and power the system. This reduces the number of charge and discharge cycles on the battery, enables proper charge termination and allows the system to turn on instantly, even if a battery is depleted. The battery charging rate is dynamically adjusted based on system voltage to ensure proper operation.

Additionally, the battery can supplement the system's current requirements when an adapter cannot deliver the peak system currents, giving a designer the option of using a smaller adapter.

The bq2407x family offers an input voltage-based dynamic power management function in USB mode that monitors the input voltage and limits the input current if the input voltage drops below a preset value. This prevents the system from crashing USB sources that are incorrectly configured or poorly designed.

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