BQ2003S-NTRG4

Overview

The BQ2003S-NTRG4 is a switch-mode fast-charge integrated circuit designed for nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) battery packs. It utilizes hysteretic pulse-width modulation to regulate charging current efficiently. The device supports negative delta-voltage (dV/dt) and temperature rate-of-change (dT/dt) termination methods to ensure safe charging cycles. It integrates closed-loop current control, allowing it to function as a cost-effective solution for both standalone applications and system-integrated designs.

Feature Summary

• Hysteretic PWM switch-mode operation for efficient charging
• Integrated closed-loop current control circuitry
• Supports negative dV and dT/dt termination protocols

Applications

• Fast charge and conditioning of NiCd batteries
• Fast charge and conditioning of NiMH batteries
• System-integrated battery management solutions

Procurement Notes

Verify the specific suffix 'NTRG4' against the manufacturer's official documentation to confirm package type, tape-and-reel specifications, and RoHS compliance status. Ensure the ordering part number matches the exact functional variant required for your design, as suffixes may indicate differences in packaging or environmental certifications rather than electrical performance changes.

Selection Notes

Select this component when designing chargers for NiCd or NiMH chemistries requiring switch-mode efficiency. It is suitable for applications needing integrated current regulation without external sense resistors. Consider its termination capabilities if precise cycle cutoff based on voltage drop or thermal rise is required for battery longevity and safety.

Part Context

This part belongs to Texas Instruments' family of battery charge management ICs. It is specifically categorized under fast-charge controllers for non-lithium chemistries. The device replaces older linear charger topologies by offering higher efficiency through switch-mode operation, reducing heat dissipation in portable electronic devices utilizing nickel-based power sources.

Replacement Considerations

Consult the TI datasheet for direct pin-compatible alternatives within the same series. Verify that any substitute maintains support for NiCd/NiMH termination algorithms and hysteretic PWM control to ensure compatibility with existing battery pack protection circuits.