MAX11068GUU+

Overview

The MAX11068GUU+ is a high-voltage, 12-channel battery monitoring smart data-acquisition interface designed for multi-cell series rechargeable battery packs in automotive and hybrid electric vehicles. It integrates a 12-bit SAR ADC with ±0.25% accuracy, completing a 12-cell voltage scan in 107μs. The device supports up to 31 units daisy-chained via SMBus/I2C to monitor 372 cells. Key features include 200mA cell balancing, dual temperature inputs, and a 6V–70V input linear regulator. It operates from -40°C to +105°C in a 38-pin TSSOP package and meets AEC-Q100 Grade 2 standards.

Feature Summary

• Integrates a 12-channel high-voltage analog front-end with a fast successive approximation register (SAR) analog-to-digital converter for precise differential voltage measurement.
• Provides active cell balancing capability through integrated switches supporting up to 200mA output current per channel.
• Features a robust serial communication interface compatible with SMBus and I2C, including automatic addressing and CRC verification for reliable multi-device linking.
• Includes comprehensive safety mechanisms such as overvoltage/undervoltage detection, open-circuit monitoring, and fault-tolerant hardware handshaking.

Applications

• Battery management systems for electric vehicles (EVs)
• Hybrid electric vehicle (HEV) battery packs
• Multi-cell series energy storage systems

Procurement Notes

Verify the specific suffix 'GUU+' against the manufacturer's latest documentation to ensure correct pinout and packaging specifications. Confirm that the component status aligns with design requirements, as this part may be subject to obsolescence notices or replacement recommendations by Analog Devices. Ensure compliance with RoHS directives and AEC-Q100 Grade 2 qualification if required for automotive integration.

Selection Notes

Select this component for applications requiring high integration and low power consumption in multi-cell battery architectures. The built-in linear regulator simplifies power supply design, while the high-speed scanning reduces system latency. Consider the 38-pin TSSOP footprint for PCB layout constraints. Evaluate the need for daisy-chaining capabilities if monitoring more than 12 cells in a single system.

Part Context

The MAX11068 belongs to the Maxim Integrated battery monitoring family, now under Analog Devices. It is optimized for harsh automotive environments, offering high voltage tolerance and precision. The device replaces older discrete solutions by integrating ADC, balancing, and communication interfaces into a single chip, reducing bill of materials cost and board space.

Replacement Considerations

Check Analog Devices official documentation for recommended replacements, as the MAX11068 is noted as not recommended for new designs. Verify pin compatibility and functional equivalence before substituting with newer members of the MAX110xx series.

FAQ

What is the maximum number of cells that can be monitored using a single MAX11068?

A single MAX11068 monitors up to 12 battery cells directly. By daisy-chaining up to 31 devices, the system can monitor up to 372 cells.

Does the MAX11068 support active cell balancing?

Yes, it includes integrated balancing switches that support currents up to 200mA per channel to equalize cell voltages.

What communication protocols are supported by the MAX11068?

The device supports I2C-compatible SMBus communication with automatic addressing and CRC error checking for reliable data transfer.