LT8584_15 Datasheet, PDF (1/36 Pages) Linear Technology – 2.5A Monolithic Active Cell Balancer with Telemetry Interface

LT8584
2.5A Monolithic Active Cell
Balancer with Telemetry Interface
Features
Description
n _{2.5A Typical Average Cell Discharge Current}
n _{Integrated 6A, 50V Power Switch}
n _{Integrates Seamlessly with LTC680x Family:}
No Additional Software Required
n _{Selectable Current and Temperature Monitors}
n _{Ultralow Quiescent Current in Shutdown}
n _{Engineered for ISO 26262 Compliant Systems}
n _{Isolated Balancing:}
n _{Can Return Charge to Top of Stack}
n _{Can Return Charge to Any Combination of Cells}
in Stack
n _{Can Return Charge to 12V Battery for Alternator}
Replacement
n _{Can Be Paralleled for Greater Discharge Capability}
n _{All Quiescent Current in Operation Taken from Local Cell}
n _{16-Lead TSSOP Package}
Applications
n _{Active Battery Stack Balancing}
n _{Electric and Hybrid Electric Vehicles}
n _{Fail-Safe Power Supplies}
n _{Energy Storage Systems}
The LT^®8584 is a monolithic flyback DC/DC converter de-
signed to actively balance high voltage stacks of batteries.
The high efficiency of a switching regulator significantly
increases the achievable balancing current while reducing
heat generation. Active balancing also allows for capacity re-
covery in stacks of mismatched batteries, a feat unattainable
with passive balance systems. In a typical system, greater
than 99% of the total battery capacity can be recovered.
The LT8584 includes an integrated 6A, 50V power switch,
reducing the design complexity of the application circuit.
The part runs completely off of the cell which it is discharg-
ing, removing the need for complicated biasing schemes
commonly required for external power switches. The enable
pin (D_IN) of the part is designed to work seamlessly with
the LTC680x family of battery stack voltage monitoring
ICs. The LT8584 also provides system telemetry including
current and temperature monitoring when used with the
LTC680x family of parts. When the LT8584 is disabled, less
than 20nA of total quiescent current is typically consumed
from the battery.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap and isoSPI are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 6518733 and 6636021.
Typical Application
MODULE⁺
12-Cell Battery Stack Module with Active Balancing
2.5A AVERAGE
DISCHARGE
MODULE⁺
•
V⁺
+
BAT 12
LTC6804
•
MODULE ^–
BATTERY STACK
MONITOR
LT8584
READ CELL PARAMETERS
C12
S12
ENABLE BALANCING
MEASURABLE CELL
PARAMETERS
2.5A AVERAGE
DISCHARGE
MODULE⁺
•
+
BAT 2
•
MODULE ^–
LT8584
READ CELL PARAMETERS
C2
S2
ENABLE BALANCING
EXTRACTABLE CELL
PARAMETERS
2.5A AVERAGE
DISCHARGE
MODULE⁺
•
+
BAT 1
•
MODULE ^–
LT8584
READ CELL PARAMETERS _C1
S1
ENABLE BALANCING
MODULE^–
V^–/C0
LT8584 TA01a
• V_CELL
• I_DISCHARGE
• V_REF
• TEMPERATURE
• R_CABLE + R_CONNECTOR
• SWITCHING FAULTS
• UNDERVOLTAGE
• SERIAL FAULTS
• COULOMB COUNTING
For more information www.linear.com/LT8584
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