Battery Stack Fault Monitor Provides Independent Supervision of High Voltage Li-Ion Strings

News Release ⎜
Battery Stack Fault Monitor Provides Independent
Supervision of High Voltage Li-Ion Strings
MILPITAS, CA – December 10, 2009 – Linear Technology announces the LTC®6801, a high
voltage battery stack fault monitor that operates without a microprocessor, and without the need for
optocouplers or isolators. An LTC6801 can monitor up to 12 series-connected battery cells for
overvoltage and undervoltage conditions. Multiple LTC6801 devices can be daisy chained, providing
a method to monitor each individual cell in very long battery strings. When connected in a
daisy-chain, a single differential clock output confirms that all cells in the stack are within the defined
operating range. This clock interface provides high noise immunity and ensures that fault conditions
are not hidden by frozen bits or short circuit conditions. The result is a reliable and simple design that
can serve as a complete monitoring or redundant circuit. The LTC6801 is a low cost companion to
the LTC6802 precision battery measurement and cell balancing IC, providing a backup circuit for
hybrid electric battery packs, battery backup systems, and other high powered Li-Ion battery systems.
A wide range of overvoltage and undervoltage thresholds can be set via pin connections and
the LTC6801 offers selectable threshold hysteresis and adjustable update rates. The LTC6801 is fully
specified for operation from -40°C to 85°C and two temperature sensor inputs are monitored for overtemperature faults.
“The LTC6801 incorporates a number of important reliability features, including a
comprehensive self-test to guarantee accuracy,” stated Mike Kultgen, design manager for Linear
Technology. “These features will prove invaluable for high reliability battery management systems.”
Samples, demonstration boards and the data sheet for the LTC6801 are now available. Prices
start at $4.48 each in 1,000-piece quantities. The product will be available in production quantities in
the first calendar quarter 2010. For more information, visit
Battery Stack Fault Monitor Provides Independent
Supervision of High Voltage Li-Ion Strings
page 2
Photo Caption: High Voltage Multicell Battery Stack Fault Monitor
Summary of Features: LTC6801
Monitors 4 to 12 Li-Ion Cells in Series (60V Max)
Adjustable Overvoltage and Undervoltage Levels
Stackable Architecture Enables 1000V+ Systems
Operates without a Microcontroller
Robust Fault Detection and Interface
2 Temperature Monitor Inputs
Built-in Comprehensive Self-Test
Built-in Precision 3V Reference and 5V Regulator
Fully Specified for Operation from -40°C to 85°C
36-lead SSOP Package
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits,
was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major
public companies in 2000. Linear Technology products include high performance amplifiers,
comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery
chargers, data converters, communications interface circuits, RF signal conditioning circuits,
uModule® products, and many other analog functions. Applications for Linear Technology’s
high performance circuits include telecommunications, cellular telephones, networking products
such as optical switches, notebook and desktop computers, computer peripherals,
video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer
products such as digital cameras and MP3 players, complex medical devices, automotive
electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, uModule and
are registered trademarks of Linear Technology Corp. All other trademarks are the
property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
Tel 408-432-1900 ext 2419
Alan Timmins
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
408-432-1900 ext 2233