News Release  www.linear.com
2.5A Monolithic Active Cell Balancer with Telemetry Interface
MILPITAS, CA – December 16, 2013 – Linear Technology Corporation announces the LT8584,
a monolithic flyback DC/DC converter designed to actively balance high voltage stacks of
batteries. These battery stacks are commonly found in electric and hybrid vehicles as well as failsafe power supplies and energy storage systems. Because these batteries are stacked in series, the
lowest capacity battery will limit the entire battery stack’s run-time. Ideally, the batteries would
be perfectly matched, but this is often not the case and generally gets worse as the batteries age.
Passive energy balancing offers no improved run-time as it dissipates the added energy of the
higher capacity batteries to match the lowest one. Conversely, the LT8584 offers high efficiency
active balancing, which redistributes the charge from the stronger cells (higher voltage) to charge
the weaker cells during discharge. This enables the weaker cells to continue to supply the load,
extracting 96% of the entire stack capacity where passive balancing usually extracts
approximately 80%.
The LT8584 includes an integrated 6A/50V power switch, enabling an average discharge
current of 2.5A while offering a simple and compact application circuit. Its isolated balancing
design can return charge to the top of the battery stack or to any combination of cells in the stack
or even to a 12V battery used as an alternator replacement. The LT8584 runs off of the cell that it
is discharging, removing the need for complicated biasing schemes. It integrates seamlessly via
the enable pin with the LTC680x family of battery stack voltage monitoring ICs without any
additional software. The LT8584 also provides system telemetry, including current, resistance
2.5A Monolithic Active Cell Balancer with Telemetry Interface
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and temperature monitoring when used with the LTC680x family of parts. When the LT8584 is
disabled, it draws less than 20nA of quiescent current from the battery. For applications that
require higher balancing current, multiple LT8584s can be paralleled. It is packaged in a 16-lead
TSSOP and is both FMEA and ISO 26262 compliant.
The LT8584EFE is packaged in 16-lead TSSOP and is priced starting at $2.95 each. An
industrial temperature version, the LT8584IFE is tested and guaranteed to operate from a -40°C
to 125°C operating junction temperature and is priced starting at $3.25 each. An automotive
temperature version, the LT8584HFE is tested and guaranteed to operate from a -40°C to 150°C
operating junction temperature and is priced starting at $3.50 each. All pricing is for 1,000 piece
quantities and all versions are available from stock. For more information, visit
www.linear.com/product/LT8584
Photo Caption: Actively Balances High Voltage Battery Stacks
Summary of Features: LT8584
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2.5A Typical Average Cell Discharge Current
Integrated 6A/50V Power Switch
Integrates Seamlessly with LTC680x Family: No Additional Software Required
Selectable Current & Temperature Monitors
Ultralow Quiescent Current in Shutdown
Engineered for ISO 26262 Compliant Systems
FMEA Compatible
Isolated Balancing:
o Can Return Charge to Top of Stack
o Can Return Charge to Any Combination of Cells in Stack
o Can Return Charge to 12V Battery for Alternator Replacement
Can Be Paralleled for Greater Discharge Capability
All Quiescent Current in Operation Taken from Local Cell
16-Lead TSSOP Package
2.5A Monolithic Active Cell Balancer with Telemetry Interface
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About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule 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
Communications
jhamburger@linear.com
Tel: 408-432-1900 ext 2419
Alan Timmins
alan@ezwire.com
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
ddickinson@linear.com
Tel: 408-432-1900 ext 2233
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