MAX4921BETD+

Overview

The MAX4921BETD+ is a battery protection integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It provides power-up logic and fault detection for lithium-ion battery packs. The device monitors cell voltage to prevent overcharge, over-discharge, and short-circuit conditions. It integrates high-side current sensing capabilities and communicates via an I2C interface. The component is designed for compact designs with low quiescent current consumption.

Feature Summary

• Integrated power-up logic for sequential cell balancing
• High-precision voltage monitoring for individual cells
• I2C digital interface for configuration and status reporting
• Protection against overvoltage, undervoltage, and short circuits

Applications

• Lithium-ion battery pack protection
• Portable electronic devices requiring multi-cell batteries
• Power tool battery management systems
• Medical equipment battery modules

Procurement Notes

Verify the exact suffix ETD+ corresponds to the TDFN package and tape-and-reel or tube packaging as specified in the official datasheet. Confirm RoHS compliance and automotive qualification status if required for your specific application environment. Check for any recent product change notices that may affect pinout or electrical characteristics.

Selection Notes

Select this component when precise cell-level monitoring is required for multi-cell lithium-ion configurations. Ensure the system design supports the I2C communication protocol for active management. Consider the thermal performance of the TDFN package relative to the expected current loads and ambient operating temperatures during continuous operation.

Part Context

This part belongs to the Maxim Integrated battery management family, specifically designed for safety-critical applications. It complements other components like fuel gauges and charge controllers. The MAX4921 series is widely used in industries demanding high reliability and compact form factors for energy storage solutions.

Replacement Considerations

Check for direct pin-to-pin replacements within the MAX492x series. Verify compatibility with existing PCB layouts and firmware drivers before substitution. Consult Analog Devices documentation for any newer generations offering improved accuracy or additional features.