BQ2003S

Overview

The BQ2003S is a switch-mode integrated circuit designed for the fast charging and conditioning of nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries. It utilizes hysteretic pulse-width modulation current regulation to manage charge cycles efficiently. The device incorporates closed-loop current control circuitry, enabling it to serve as the foundation for cost-effective standalone or system-integrated battery management solutions. It supports negative delta-V and delta-T/dt termination methods to ensure safe and complete charging profiles for multi-cell battery packs.

Feature Summary

• Hysteretic PWM switch-mode current regulation for efficient charging
• Integrated closed-loop current control circuitry
• Supports negative dV and dT/dt termination methods
• Push-pull output for external transistor discharge control

Applications

• Fast charging of NiCd battery packs
• Conditioning of NiMH battery systems
• Standalone battery charger modules
• System-integrated power management units

Procurement Notes

Verify the specific suffix (e.g., S, S-N) against the manufacturer's official ordering guide to confirm package type and temperature range. Ensure compatibility with the target NiCd or NiMH cell chemistry before procurement. Cross-reference the datasheet revision date to confirm technical specifications match the required design parameters. Confirm pinout configurations align with the intended PCB layout to prevent integration errors.

Selection Notes

Select this component when designing switch-mode chargers for nickel-based chemistries requiring precise current regulation. It is suitable for applications needing integrated termination logic via negative voltage drop or temperature rate detection. Consider the external N-FET requirements for buck-type regulator implementations. Evaluate the push-pull output capability if active battery discharge prior to charging is required by the system architecture.

Part Context

The BQ2003 series belongs to Texas Instruments' portfolio of battery management integrated circuits. It is often paired with external switching components, such as N-FETs, to form complete buck-type switch-mode regulators. This family addresses the need for efficient, compact charging solutions in portable electronics and industrial equipment utilizing rechargeable nickel-cadmium or nickel-metal hydride cells.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence carefully if considering alternative manufacturers, specifically regarding hysteretic PWM control and termination logic compatibility.

FAQ

What termination methods does the BQ2003S support?

The BQ2003S supports negative delta-V (dV) and delta-T/dt (dT/dt) termination methods for accurate charge completion detection.

How is the charging current regulated in this IC?

Charging current is regulated using hysteretic pulse-width modulation (PWM) switch-mode current regulation.