The bqTINY is a single-cell lithium-ion (LiIon) linear charger with enhanced thermal fold-back regulation and low dropout power management. Developed by Texas Instruments, the 3- by 3-mm battery charger integrates a 1-A power FET and current sensor that can withstand an input voltage up to 26 V.
Designed to extend battery life, the device offers complete charge management capability with unique safety and low-dropout features. The bq24060 charges the battery in the three phases required by battery cell manufacturers, including pre-charge conditioning, constant or thermally regulated current, and accurate constant voltage. The charger's algorithm reduces charge times, maximizes total charge and protects the battery from thermal and electrical dangers. The bq24060 re-starts the charge when the battery voltage falls below an internal threshold, and it enters a low-power sleep mode when the external input supply is removed.
The linear charger integrates a reverse-blocking protection scheme to prevent battery drainage in the absence of the dc supply. In addition, the bq24060 can be configured to operate in LDO mode to allow the system to fully operate without the battery. The LDO mode is also useful for board test before complete system test during the end-equipment manufacturing process.
The bq24060's over-voltage protection feature protects the charger and the system during high-voltage conditions by quickly disconnecting them from the adapter. In addition, an enhanced thermal fold-back regulation feature allows it to run continuously in harsh environments where the ambient temperature is high, or when connected to an incorrect adaptor with a higher input voltage.
The bq24060 charger is available today in volume. Suggested retail pricing in 1000-piece quantities is $1.20. Evaluation modules of the bq24060, design application notes, and TI's on-line power management selection tool are available at power.ti.com. More information on the bq24060 can be found at www.ti.com/sc06124.