MAX14921ECS+

Overview

The MAX14921ECS+ is a high-accuracy analog front-end (AFE) for battery management, supporting up to 16 lithium-ion cells. It operates within a supply voltage range of 6 V to 65 V and features a TQFP-80 surface-mount package. The device provides simultaneous cell voltage sampling with a maximum error of ±0.5 mV, enabling precise state-of-charge determination. It includes integrated diagnostics for open-wire detection and undervoltage/overvoltage alarms. Operating temperatures span from -40°C to +85°C, with a quiescent current of 65 µA.

Feature Summary

• Simultaneous multi-cell voltage sampling for accurate state-of-charge calculation
• Integrated diagnostics including open-wire detection and thermal shutdown
• Low-noise amplifier buffering for monitoring various lithium-ion chemistries
• Daisy-chainable SPI interface for system integration

Applications

• Industrial battery backup systems
• Telecom battery backup systems
• Energy storage packs
• E-transportation energy packs

Procurement Notes

Verify the specific suffix 'ECS+' against official Analog Devices documentation to confirm the TQFP-80 package configuration. Confirm RoHS compliance status through manufacturer datasheets. Ensure the component meets extended temperature specifications (-40°C to +85°C) required for the target application environment before finalizing procurement.

Selection Notes

Select this AFE for applications requiring high precision in flat-discharge curve chemistries like lithium-metal phosphate. The 16-cell capacity suits larger battery stacks compared to the 12-cell MAX14920 variant. Consider the TQFP-80 footprint constraints and the need for external FET drivers if passive balancing is required for the specific design.

Part Context

This component belongs to the MAX1492x series of high-accuracy battery measurement AFEs manufactured by Analog Devices/Maxim Integrated. It serves as a specialized power management IC designed for primary and secondary battery pack monitoring, offering level shifting and unity gain amplification to simplify external ADC data conversion.

Replacement Considerations

The MAX14920 is a compatible alternative for systems requiring monitoring of up to 12 cells instead of 16. Both devices share similar accuracy and diagnostic features but differ in pin count and package size (64-pin vs. 80-pin). Verify PCB layout compatibility when substituting.