bq2004E/H
Fast-Charge ICs
Features
➤ Fast charge and conditioning of nickel cadmium or nickel-metal hydride batteries
...
bq2004E/H
Fast-Charge ICs
Features
➤ 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 ∆ temperature/∆ time, peak volume detection, -∆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)
General Description
The bq2004E and bq2004H Fast Charge ICs provide 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 systemintegrated chargers for batteries of one or more cells.
Switch-activated discharge-beforecharge allows bq2004E/H-based chargers to support battery conditioning and capacity determination.
High-efficiency power conversion is accomplished using the bq2004E/H as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2004E/H may alternatively be used to gate an externally regulated charging current.
Fast charge may begin on application of the charging supply, rep...