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TI charge-management ICs suit portable apps

Posted: 16 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? bq24? bqtiny? charge management ic? power management ic?

Texas Instruments has announced the availability of its bq24 series of charge-management ICs for use in single-cell Li-ion and Li-pol battery packs in space constrained portable applications such as PDAs, smart phones, MP3 players, and DSCs.

The bqTINY devices are packaged in a 3-by-3mm MLP housing and integrate a 1A MOSFET, current sensor, reverse blocking diode, current and voltage regulation, and charge termination circuit.

The 1A power MOSFET and the package's thermal properties, enable the ICs to support high-current charging, while the integrated current sensor with a programmable current set-point input provides design flexibility and eliminates the need for external sense resistors. The integrated reverse-blocking protection scheme prevents battery drainage in the absence of the dc supply.

Other integrated features include safety timers for pre-charge and fast charge phases, and charge status outputs to LEDs or a microcontroller.

The bq24 series employs the three-phase charging algorithm required by battery cell manufacturers that is claimed to reduce charge times, maximize the total charge, and protect the battery from a variety of thermal and electrical dangers. An automatic sleep mode reduces drainage on the battery when the input supply is removed.

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