bq24006 Datasheet | Texas Instruments

URES - 2 Highly Integrated Solution With FET Pass Transistor and Reverse-Blocking Schottky and Thermal Protection - Integrated Voltage and Current Regulation With Programmable Charge Current - High-Accuracy Voltage Regulation (±1%) - Ideal for Low-Dropout Linear Charger Designs for Two-Cell Li-Ion Packs With Coke or Graphite Anodes - Up to 1.2-A Continuous Charge Current - Safety-Charge Timer During Preconditioning and Fast Charge - Integrated Cell Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage of Charge - Optional Temperature or Input-Power Monitoring Before and During Charge - Various Charge-Status Output Options for Driving Single, Double, or Bicolor LEDs or Host-Processor Interface - Charge Termination by Minimum Current and Time - Low-Power Sleep Mode - Packaging: 20-Lead TSSOP Power PAD™ APPLICATIONS - PDAs - Internet Appliances - MP3 Players - Digital Cameras DESCRIPTION The bq2400x series ICs are advanced Li-Ion linear charge management devices for highly integrated and space-limited applications. They bine highaccuracy current and voltage regulation; FET passtransistor and reverse-blocking Schottky; battery conditioning, temperature, or input-power monitoring; charge termination; charge-status indication; and charge timer in a small package. The bq2400x measures battery temperature using an external thermistor. For safety, the bq2400x inhibits charge until the battery temperature is within the user-defined thresholds. Alternatively, the user can monitor the input voltage to qualify charge. The bq2400x series then charge the battery in three phases: preconditioning, constant current, and constant voltage. If the battery voltage is below the internal low-voltage threshold, the bq2400x uses lowcurrent precharge to condition the battery. A preconditioning timer provides additional safety. Following pre- conditioning, the bq2400x applies a constant-charge current to the battery. An external sense-resistor...