The document describes the features and characteristics of the bq2005 Fast-Charge IC, including sequential fast charge and conditioning of two NiCd or NiMH battery packs, hysteric PWM switch-mode current regulation or gated control of an external regulator, easy integration into systems or use as a stand-alone charger, pre-charge qualification of temperature and voltage, direct LED outputs display battery and charge status, fast-charge termination by ∆ temperature/∆ time, -∆V, maximum voltage, maximum temperature, and maximum time, optional top-off and pulse-trickle charging.
The bq2005 is a monolithic CMOS device designed to provide comprehensive fast charge control functions for two nickel cadmium (NiCd) or nickel-metal hydride (NiMH) battery packs. It integrates closed-loop current control circuitry, allowing it to serve as the basis for cost-effective stand-alone or system-integrated chargers.
The IC supports high-efficiency power conversion using hysteretic PWM switch-mode regulation or can gate an externally regulated charging current. Key features include pre-charge qualification of temperature and voltage, direct LED outputs for status display, and multiple termination methods such as rate of temperature rise, negative delta voltage, maximum voltage, maximum temperature, and maximum time.
| Supply Voltage | 5.0 V, +10% |
|---|---|
| Package Type | 20-Pin DIP or SOIC |
| Battery Chemistry Support | NiCd or NiMH |
The device supports sequential fast charge and conditioning for two nickel cadmium or nickel-metal hydride battery packs.
Fast charge stops based on temperature rise rate, negative delta voltage, maximum voltage, maximum temperature, or maximum time.
The Vcc supply input requires 5.0V with a tolerance of plus or minus 10%.