BQ2004是TI公司的一款电池充电器IC产品，BQ2004是具有负 dV、峰值电压检测、dT/dt 终端的镍镉电池/镍氢电池开关模式充电管理 IC，本页介绍了BQ2004的产品说明、应用、特性等，并给出了与BQ2004相关的TI元器件型号供参考。
BQ2004 - 具有负 dV、峰值电压检测、dT/dt 终端的镍镉电池/镍氢电池开关模式充电管理 IC - 电池充电器IC - 电池管理产品 - TI公司（Texas Instruments，德州仪器）
The bq2004 Fast Charge IC provides comprehensive fast charge control functions together with high-speed switching power control circuitry on a monolithic CMOS device.
Integration of closed-loop current control circuitry allows the bq2004 to be the basis of a cost-effective solution for stand-alone and system integrated chargers for batteries of one or more cells.
Switch-activated discharge-before charge allows bq2004-based chargers to support battery conditioning and capacity determination.
High-efficiency power conversion is accomplished using the bq2004 as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2004 may alternatively be used to gate an externally regulated charging current.
Fast charge may begin on application of the charging supply, replacement of the battery, or switch depression. For safety, fast charge is inhibited unless/until the battery temperature and voltage are within configured limits.
Temperature, voltage, and time are monitored throughout fast charge. Fast charge is terminated by any of the following:
Rate of temperature time (t) Peak voltage detection (PVD) Negative delta voltage (-V) Maximum voltage Maximum temperature Maximum timeAfter fast charge, optional top-off and pulsed current maintenance phases are available.
- Fast charge and conditioning of nickel cadmium or nickel-metal hydride batteries
- Hysteretic PWM switch-mode current regulation or gated control of an external regulator
- Easily integrated into systems or used as a stand-alone charger
- Pre-charge qualification of temperature and voltage
- Configurable, direct LED outputs display battery and charge status
- Fast-charge termination by V, maximum voltage, maximum temperature, and maximum time
- Optional top-off charge and pulsed current maintenance charging
- Logic-level controlled low-power mode (< 5µA standby current)
