Electronics and Semiconductors

Freescale Expands Highly Integrated Battery Cell Controller Portfolio

17 September 2015

The introduction of the MC33772 three- to six-cell lithium-ion (Li-ion) battery cell controller expands Freescale’s portfolio of highly integrated and connected solutions for automotive and industrial battery systems.

Along with the previously announced MC33771 14-cell battery cell controller, the MC33772 product expands Freescale’s portfolio to encompass a full range of single chip three- to 14-cell solutions. Supporting an array of battery chemistries, including Li-ion phosphate, lithium nickel manganese cobalt oxide, lithium titanate and lithium polymer, the company’s cell controller portfolio helps customers scale solutions to meet different battery management needs without new R&D investments. In addition, its battery cell controllers feature advanced diagnostics and functional verification supporting ISO 26262 ASIL-C requirements within a single chip.

Lead-acid automotive batteries are increasingly being replaced by Li-ion chemistries to reduce weight, increase reliability and boost energy efficiency for engine start-stop systems and energy recuperation technologies. Recent advances in Li-ion battery chemistry for cold temperature operation and cold cranking power now enable them to displace lead-acid even as the starter battery. As a result, the inherent challenges of overcharge, overheating and internal short circuit are increasingly managed by electronics. To maintain safe operating conditions and ensure system-wide control of the battery, next-generation battery cell controllers must provide accurate, reliable battery diagnostics and high speed communication of status.

The MC33772 battery cell controller single chip solution is optimized for all critical performance and safety duties, featuring robust functional verification supporting ISO 26262 ASIL-C requirements, which help protect automotive and industrial battery packs against critical fault conditions. Higher level ASIL-D system implementations can also be realized using multiple Freescale battery cell controllers for redundancy.

In addition to 14V Li-ion battery packs, the MC33772 product’s optimized feature set is suited for reducing system electronics BOM cost in a broad range of automotive and industrial battery management applications, including 48V battery systems, high voltage hybrid and electric cars, E-bikes and energy storage systems. The MC33772 delivers measurement accuracy, scalability and high speed isolated communications. It supports rapid, 2Mbps communication of battery health and conditions for a variety of battery management system topologies, including centralized, distributed CAN and distributed daisy chain systems.

The MC33772 is engineered to help customers easily meet stringent ISO 26262 ASIL-C requirements through integrated functional verification and advanced diagnostic features in single-chip. An ASIL-D system level implementation is also possible with Freescale battery cell controllers, allowing customers to meet multiple functional safety concepts and address safety system level requirements. As a Freescale SafeAssure functional safety solution, this portfolio meets rigorous standards for ESD, EMC, low current consumption and AEC-Q100 automotive qualified design.

Freescale offers hardware to support the MC33771 and MC33772 battery cell controllers and the MC33664 transformer physical layer with the KIT33771ASP1EVB, KIT33772ASP1EVB and KIT33664EVB evaluation kits.

The MC33771, MC33772 and MC33664 products are sampling now. The MC33771 and MC33664 products are expected to be in production by Q4 2015, while the MC33772 product is planned for production by Q2 2016. The MC33771 will be available for a suggested retail price starting at $4.86 in 10kU quantities, and the MC33772 will be available for a suggested retail price starting at $3.46 depending on cell count and feature set. The MC33664 will be available for a suggested retail price of $1.65 in 10kU quantities.

To contact the author of this article, email engineering360editors@ihs.com

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