MAX14921ECS+T

Overview

The MAX14921ECS+T is a high-accuracy analog front-end (AFE) designed for battery management systems. It monitors up to 16 series-connected lithium-ion cells with a maximum stack voltage of 65V. The device features simultaneous sampling of all cell voltages, enabling precise state-of-charge and source-resistance determination. It includes a low-noise amplifier that buffers differential voltages up to 5V, resulting in a cell voltage error of ±0.5mV. The component operates within an extended temperature range of -40°C to +85°C and utilizes a daisy-chainable SPI interface for control.

Feature Summary

• Simultaneous multi-cell voltage sampling for accurate state-of-charge calculation
• Integrated diagnostics including open-wire detection and thermal shutdown
• Supports passive cell balancing via external FET drivers
• Daisy-chainable serial peripheral interface for system integration

Applications

• Industrial battery backup systems
• Telecom battery backup infrastructure
• Energy storage packs
• Electric transportation energy packs

Procurement Notes

Verify the suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm the specific manufacturer lot and date code against current production status. Ensure the order matches the exact pinout and package dimensions of the 80-pin TQFP variant. Cross-reference the datasheet revision to confirm feature compatibility.

Selection Notes

Select this AFE for applications requiring high precision on flat discharge curves like LFP. The 16-cell capacity suits larger battery stacks compared to the 12-cell MAX14920. Consider the 80-pin TQFP footprint for PCB layout constraints. Verify that the external balancing circuitry meets the system's power dissipation requirements.

Part Context

This component belongs to the MAX1492x family of high-accuracy battery measurement AFEs from Analog Devices/Maxim Integrated. It serves as the primary monitoring interface for multi-cell lithium-ion battery packs. The device simplifies data conversion by level-shifting cell voltages to ground reference with unity gain.

Replacement Considerations

The MAX14920ECS+ offers identical functionality but supports up to 12 cells instead of 16. Both devices share similar diagnostic features and SPI interfaces. Verify that the reduced cell count of the alternative meets the specific battery pack architecture requirements.