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Date: 19-09-15

Controller chips for 3- to 14-cell Li-ion batteries

Freescale Semiconductor today introduced the MC33772 3- to 6-cell lithium-ion battery cell controller.

Along with the previously announced MC33771 14-cell battery cell controller, the MC33772 covers full range of single chip 3- to 14-cell solutions. MC33771 and MC33772 supports broad array of battery chemistries, including lithium iron phosphate, lithium nickel manganese cobalt oxide, lithium titanate, and lithium polymer. MC33771 14-cell battery cell controller, the MC33772 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 Li-ion batteries 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 like Freescale’s must provide accurate, reliable battery diagnostics and high speed communication of status. " explains Freescale in its release.

“Drivers face a host of issues and concerns about their lead-acid batteries, many of which are caused by outside elements like extreme temperatures that are hard to control, causing about 100 million batteries to be replaced every year in the U.S. alone,” said James Bates, senior vice president and general manager for Freescale’s Analog & Sensors Group. “With the expansion of our broad portfolio of battery cell controllers, Freescale is helping reduce those concerns, making it easier for our customers to offer an effective Li-ion alternative to lead-acid, while meeting stringent performance and functional safety requirements across a wide variety of battery sizes and types.”

MC33772 is suggested for 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. MC33772 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.

Key Features as shared by Freescale:
Available in 3, 4, 5 and 6 cell versions
5V (SPI)/7V (TPL) ≤ VPWR ≤ 30 V operation, 40 V transient
SPI or isolated 2 MHz differential communication using MC33664 TPL
Current sensor with ±0.5% accuracy from milliamps to kiloamps
6x differential cell voltage measurement and stack voltage measurement
Synchronized cell voltage/current measurement
Coulomb counting
7x ADC/GPIO/temperature sensor inputs
Addressable on initialization
6x onboard 300 mA passive cell balancing drivers w/ dedicated timers
Low-power modes
48-pin QFP package

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 (USD) in 10kU quantities, and the MC33772 will be available for a suggested retail price starting at $3.46 (USD) depending on cell count and feature set. The MC33664 will be available for a suggested retail price of $1.65 (USD) in 10kU quantities.

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