MAX17843ACB/V+

Overview

The MAX17843ACB/V+ is a high-voltage, 12-channel battery monitoring smart data acquisition interface designed for automotive and industrial applications. It integrates an analog front-end with differential voltage measurement capabilities ranging from 0V to 5.0V. The device features a 14-bit SAR ADC with over-sampling for precise digitization, measuring all 12 cells within 142μs using a dual-scan method. It includes two auxiliary analog inputs for NTC thermistors, bare-die temperature sensing, and internal cell balancing switches supporting up to 150mA per switch. Powered by a 9V to 65V input linear regulator, it operates between -40°C and +125°C in a 64-pin LQFP package.

Feature Summary

• Integrates a 12-channel differential analog front-end with a high-resolution 14-bit SAR ADC for accurate battery voltage monitoring.
• Features a robust differential daisy-chain UART interface supporting up to 32 connected ICs for scalable system architecture.
• Includes integrated cell balancing switches capable of handling up to 150mA current per channel for active management.
• Provides comprehensive diagnostic functions and thermal protection to meet ASIL D safety requirements.

Applications

• 48V automotive battery modules or systems
• Hybrid electric vehicle (HEV) battery packs
• Electric vehicle (EVS) high-voltage battery stacks
• High-power battery backup systems

Procurement Notes

Verify the specific suffix 'ACB/V+' against the manufacturer's official datasheet to confirm temperature grade and packaging details. Ensure compatibility with the required operating voltage range of 9V to 65V. Confirm that the 64-pin LQFP footprint matches the design layout. Check for AEC-Q100 qualification status if automotive reliability is mandated.

Selection Notes

Select this component when a highly integrated solution for multi-cell battery monitoring is required. It is suitable for designs needing simultaneous high-speed voltage sampling and active cell balancing. Consider the 14-bit resolution and dual-scan accuracy for applications demanding precise state-of-charge estimation. Verify that the UART interface meets the communication bandwidth needs of the host microcontroller.

Part Context

This part belongs to the MAX178xx series of high-voltage battery monitors from Analog Devices/Maxim Integrated. These devices are engineered for harsh environments, offering integrated protection and diagnostics. The series supports various channel counts and balancing currents, positioning the MAX17843 as a specialized solution for complex battery management architectures requiring high precision and safety compliance.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer's product selection guide for potential family alternatives with similar channel counts or balancing specifications.

FAQ

How does the MAX17843 ensure measurement accuracy across varying temperatures?

It utilizes a 2-scan method to collect and correct battery measurements, ensuring excellent accuracy throughout the temperature range despite extreme system noise.

What is the maximum number of devices that can be connected in a daisy chain?

Up to 32 MAX17843 ICs can be connected in a single daisy chain via the differential UART interface.

Can the device monitor external temperature sensors?

Yes, it has two auxiliary analog inputs (AUXIN) configurable for negative temperature coefficient (NTC) thermistors to monitor module or battery temperature.