MC33771BTA2AE

Overview

The MC33771BTA2AE is a 14-channel Li-ion battery cell controller IC designed for automotive and industrial applications. It operates within a supply voltage range of 9.6 V to 61.6 V, supporting 75 V transients. The device features 14 differential cell voltage measurement channels with a maximum total stack voltage measurement error of 0.8 mV. It integrates an advanced current sensor with PGA offering ±0.5% accuracy from milliamps to kiloamps, alongside an integrated coulomb counter. Onboard passive balancing utilizes 300 mA low Rdson MOSFETs. Communication is supported via standard SPI or transformer-isolated daisy chain (with MC33664) at up to 4 Mbps SPI or 2.0 Mbps TPL. It complies with ISO 26262 up to ASIL D and AEC-Q100 standards.

Feature Summary

• Integrates high-precision ADC conversions for differential cell voltages, currents, and temperature measurements with synchronized coulomb counting.
• Features embedded 300 mA passive balancing transistors with dedicated programmable timers and comprehensive diagnostic capabilities.
• Supports isolated daisy chain communication using MC33664 or standard SPI interfaces for robust data processing and control.
• Provides extensive fault verification including OV/UV, OT/UT, and OC detection, ensuring functional safety compliance.

Applications

• Hybrid Electric Vehicles (HEV)
• Electric Vehicles (EV)
• Energy Storage Systems (ESS)
• Uninterruptible Power Supplies (UPS)

Procurement Notes

Verify the specific suffix 'A2' against official NXP documentation to confirm exact binning or revision status, as suffixes often denote manufacturing lot variations rather than functional differences. Ensure compatibility with MPC5xxx MCU families if integrating into existing architectures. Confirm package type LQFP64 matches design constraints. Check for required Non-Disclosure Agreements (NDA) when accessing detailed datasheets or safety manuals directly from the manufacturer.

Selection Notes

Select this component for high-voltage battery management systems requiring 14 independent cell monitoring channels. It is suitable for designs needing integrated passive balancing and high functional safety ratings up to ASIL D. Consider the need for external isolation components like the MC33664 if utilizing the transformer-based daisy chain topology. Evaluate thermal performance requirements given the onboard balancing MOSFETs and operating voltage range.

Part Context

This part belongs to the MC33771 family of lithium-ion battery controllers from NXP Semiconductors. It is specifically engineered for demanding automotive and industrial environments where reliability and safety are critical. The device is part of a broader ecosystem that includes companion transceivers like the MC33664 for isolated communication, facilitating scalable battery pack architectures.

Replacement Considerations

MC33771BTA1AE

FAQ

What is the maximum transient voltage the MC33771BTA2AE can withstand?

The device supports a transient voltage of up to 75 V while operating within a supply voltage range of 9.6 V to 61.6 V.

Does the MC33771BTA2AE support active cell balancing?

No, it features onboard passive balancing using 300 mA low Rdson MOSFETs with diagnostics and programmable timers.

Which communication protocols are supported by this IC?

It supports standard SPI communication and transformer-isolated daisy chain communication when used with the MC33664 transceiver.