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Unformatted text preview: www.ti.com FEATURES DESCRIPTION APPLICATIONS bq24004 bq24005 bq24006 SLUS476DDECEMBER 2000REVISED SEPTEMBER 2005 TWO-CELLLi-IONCHARGEMANAGEMENTIC FORPDAsANDINTERNETAPPLIANCES Highly Integrated Solution With FET Pass The bq2400x series ICs are advanced Li-Ion linear Transistor and Reverse-Blocking Schottky charge management devices for highly integrated and and Thermal Protection space-limited applications. They combine high- accu- racy current and voltage regulation; FET pass- tran- Integrated Voltage and Current Regulation sistor and reverse-blocking Schottky; battery con- With Programmable Charge Current ditioning, temperature, or input-power monitoring; High-Accuracy Voltage Regulation (1%) charge termination; charge-status indication; and Ideal for Low-Dropout Linear Charger Designs charge timer in a small package. for Two-Cell Li-Ion Packs With Coke or The bq2400x measures battery temperature using an Graphite Anodes external thermistor. For safety, the bq2400x inhibits Up to 1.2-A Continuous Charge Current charge until the battery temperature is within the user-defined thresholds. Alternatively, the user can Safety-Charge Timer During Preconditioning monitor the input voltage to qualify charge. The and Fast Charge bq2400x series then charge the battery in three Integrated Cell Conditioning for Reviving phases: preconditioning, constant current, and con- Deeply Discharged Cells and Minimizing Heat stant voltage. If the battery voltage is below the Dissipation During Initial Stage of Charge internal low-voltage threshold, the bq2400x uses low-current precharge to condition the battery. A Optional Temperature or Input-Power preconditioning timer provides additional safety. Fol- Monitoring Before and During Charge lowing pre- conditioning, the bq2400x applies a con- Various Charge-Status Output Options for stant-charge current to the battery. An external Driving Single, Double, or Bicolor LEDs or sense-resistor sets the magnitude of the current. The Host-Processor Interface constant-current phase is maintained until the battery Charge Termination by Minimum Current and reaches the charge-regulation voltage. The bq2400x then transitions to the constant voltage phase. The Time user can configure the device for cells with either Low-Power Sleep Mode coke or graphite anodes. The accuracy of the voltage Packaging: 20-Lead TSSOP PowerPAD regulation is better than 1% over the operating junction temperature and supply voltage range. Charge is terminated by maximum time or minimum PDAs taper current detection Internet Appliances The bq2400x automatically restarts the charge if the MP3 Players battery voltage falls below an internal recharge Digital Cameras threshold....
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