MC33772BTA2AE

Overview

The MC33772BTA2AE is a lithium-ion battery cell controller IC designed for automotive and industrial applications. It manages 3 to 6 battery cells with a supply voltage range of 6 V to 30 V and transient tolerance up to 40 V. The device features advanced voltage and temperature measurement, synchronized current measurement with integrated coulomb counting, and onboard passive balancing. It supports isolated daisy chain communication at 2.0 Mbps or standard SPI at 4.0 Mbps. Packaged in an LQFP-48, it operates between -40°C and +125°C.

Feature Summary

• Supports isolated transformer-based daisy chain communication or standard SPI interfaces for robust data exchange.
• Integrates onboard passive cell balancing transistors with diagnostic capabilities and programmable timers.
• Provides high-precision differential cell voltage and stack voltage measurements with low total error.
• Includes synchronized current sensing with an integrated PGA and coulomb counter for accurate state estimation.

Applications

• Hybrid Electric Vehicle (HEV) battery management systems
• Electric Vehicle (EV) traction battery monitoring
• Energy Storage Systems (ESS)
• Uninterruptible Power Supply (UPS) units

Procurement Notes

Verify the specific suffix 'AER2' against the ordered part number 'MC33772BTA2AE', as datasheets indicate 'AER2' denotes reel packaging while other suffixes may imply tray packaging. Confirm AEC-Q100 qualification status and ISO 26262 ASIL D compliance requirements for the target application environment. Ensure compatibility with the intended MCU interface, specifically checking for transformer isolation requirements if using daisy chain mode.

Selection Notes

Select this component for applications requiring management of 3 to 6 series-connected lithium-ion cells within a 30 V system. It is suitable for designs needing integrated passive balancing and precise coulomb counting without external ADCs. Consider the MC33772C variant if higher node counts in daisy chains or loopback support are required, as the B-series has limited daisy chain capabilities compared to the C-series.

Part Context

The MC33772B belongs to NXP's MC3377x family of battery cell controllers, specifically tailored for lower voltage architectures like 12 V systems compared to the 14-channel MC33771. It complements the MC33664 transceiver for isolated communication. This B-series variant offers core balancing and measurement functions but lacks some advanced daisy chain features found in the subsequent C-series generation.

Replacement Considerations

The MC33772CTA2AE is a compatible alternative within the same package, offering enhanced daisy chain capabilities including loopback support and higher node counts. Verify that the functional differences in communication protocols do not impact existing firmware logic before substitution.

FAQ

Does the MC33772B support loopback functionality in daisy chain mode?

No, the MC33772B does not support loopback functionality. This feature is available in the MC33772C variant.

What is the maximum number of nodes supported in a daisy chain configuration?

The MC33772B supports up to 15 nodes in a single daisy chain. The MC33772C supports up to 63 nodes.

Is the device qualified for automotive applications?

Yes, the MC33772B is hot-plug capable and compliant with AEC-Q100 standards for automotive use.