特性Safe Management of Fast Charge for NiCd, NiMH, or Li-Ion Battery Packs High-Frequency Switching Controller for Efficient and Simple Charger DesignPre-Charge Qualification for Detecting Shorted, Damaged, or Overheated CellsFast-Charge Termination by Peak Voltage (PVD) for Nickel chemistries, Minimum Current for Li-Ion chemistries, Maximum Temperature, and Maximum Charge TimeSelectable Top-Off Mode for Achieving Maximum Capacity in NiMH BatteriesProgrammable Trickle-Charge Mode for Reviving Deeply Discharged Batteries and for Postcharge MaintenanceBuilt-in Battery Removal and Insertion DetectionSleep Mode for Low Power Consumption APPLICATIONSMulti-Chemistry ChargerNickel ChargerHigh-Power, Multi-Cell ChargerGENERAL DESCRIPTION The bq2000 is a programmable, monolithic IC for fast-charge management of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lithium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The bq2000 chooses the proper battery chemistry (either nickel or lithium) and proceeds with the optimal charging and termination algorithms. This process eliminates undesirable, undercharged, or overcharged conditions, and allows accurate and safe termination of fast chargeDepending on the chemistry, the bq2000 provides a number of charge termination criteria: Peak voltage, PVD (for NiCd and NiMH)Minimum charge current (for Li-Ion)Maximum temperatureMaximum charge timeFor safety, the bq2000 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the bq2000 uses trickle-charge to condition the battery. For NiMH batteries, the bq2000 provides an optional top-off charge to maximize the battery capacity.The integrated high-speed comparator allows the bq2000 to be the basis for a complete, high-efficiency battery charger circuit for both nickel-based and lithium-based chemistries.