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TI battery charger allows USB, ac adapter charging

Posted: 23 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? bgtiny ii? bgtiny? battery charger ic? power management ic?

Texas Instruments Inc. has announced the availability of what it claims to be the smallest and most integrated single-cell Li-ion and lithium polymer battery charger to enable PDAs, cellphones, digital cameras, and wireless headsets to charge from a USB port or ac wall adapter.

The bgTINY II series of battery chargers is packaged in a 10-lead, 3-by-3mm QFN package and integrates power FETs, current sensor, voltage and current regulation, safety timers for pre-charge and fast charge phases, charge status outputs, temperature sensor, and charge termination.

The device has the ability to automatically select a USB port or an ac adapter as the power source for the devices, enabling them to stay powered-up anywhere, the company claims. In USB configuration, the host device, such as a PDA or cellphone, can select from two preset charge rates of 100mA and 500mA. In ac adapter configuration, the integrated power FET allows up to 1A of charge current.

bgTINY II devices charge the battery in three phases required by battery cell manufacturers, including pre-charge conditioning, constant current and accurate constant voltage. The algorithm reduces charge times, maximizes total charge and protects the battery from thermal, and electrical dangers.

The charger re-starts the charge when the battery voltage falls below an internal threshold, and enters a low-power sleep mode when both supplies are removed.

As with other members of the bgTINY family, the bgTINY II chargers integrate a reverse-blocking protection scheme to prevent battery drainage in the absence of the dc supply.





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