LT8584
2.5A Monolithic Active Cell
Balancer with Telemetry Interface
Fea T Descrip T
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2.5A Typical Average Cell Discharge Current The LT 8584 is a monolithic flyback DC/DC converter de-
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Integrated 6A, 50V Power Switch signed to actively balance high voltage stacks of batteries.
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Integrates Seamlessly with LTC680x Family: The high efficiency of a switching regulator significantly
No Additional Software Required
increases the achievable balancing current while reducing
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Selectable Current and Temperature Monitors
heat generation. Active balancing also allows for capacity re-
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Ultralow Quiescent Current in Shutdown
covery in stacks of mismatched batteries, a feat unattainable
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Engineered for ISO 26262 Compliant Systems
with passive balance systems. In a typical system, greater
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Isolated Balancing:
than 99% of the total battery capacity can be recovered.
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Can Return Charge to Top of Stack
The LT8584 includes an integrated 6A, 50V power switch,
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Can Return Charge to Any Combination of Cells
reducing the design complexity of the application circuit.
in Stack
The part runs completely off of the cell which it is discharg-
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Can Return Charge to 12V Battery for Alternator
ing, removing the need for complicated biasing schemes
Replacement
commonly required for external power switches. The enable
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Can Be Paralleled for Greater Discharge Capability
pin (D ) of the part is designed to work seamlessly with
n IN
All Quiescent Current in Operation Taken from Local Cell
the LTC680x family of battery stack voltage monitoring
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16-Lead TSSOP Package
ICs. The LT8584 also provides system telemetry including
current and temperature monitoring when used with the
a T
LTC680x family of parts. When the LT8584 is disabled, less
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Active Battery Stack Balancing
than 20nA of total quiescent current is typically consumed
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Electric and Hybrid Electric Vehicles
from the battery.
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Fail-Safe Power Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
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Swap and isoSPI are trademarks of Linear Technology Corporation. All other trademarks are the
Energy Storage Systems
property of their respective owners. Protected by U.S. Patents, including 6518733 and 6636021.
Typical a T
+ 12-Cell Battery Stack Module with Active Balancing
MODULE
2.5A AVERAGE
+
MODULE
+
DISCHARGE
V
LTC6804
BATTERY STACK
+
MODULE
BAT 12 MONITOR
READ CELL PARAMETERS
C12
LT8584
V
S12 CELL
ENABLE BALANCING I
MEASURABLE CELL
DISCHARGE
PARAMETERS V
REF
TEMPERATURE
2.5A AVERAGE
+
MODULE
DISCHARGE
+
BAT 2
MODULE
R + R
CABLE CONNECTOR
READ CELL PARAMETERS
C2 SWITCHING FAULTS
LT8584
EXTRACTABLE CELL
S2
UNDERVOLTAGE
ENABLE BALANCING PARAMETERS
SERIAL FAULTS
COULOMB COUNTING
2.5A AVERAGE
+
MODULE
DISCHARGE
+
BAT 1 MODULE
READ CELL PARAMETERS
C1
LT8584
S1
V /C0
ENABLE BALANCING
LT8584 TA01a
MODULE
8584fb
1
For more information www.linear.com/LT8584
ion pplica
ions pplica
ion uresLT8584
a Te Maxi Mu M r a T p c F T
(Note 1)
TOP VIEW
D to GND Voltage ................................................. 10V
IN
GND 1 16 SW
V , V , V MODE, OUT,
IN CELL SNS,
GND 2 15 SW
DCHRG Voltage ............................................ 0.3V to 9V
GND 3 14 SW
RTMR Voltage .................................................... (Note 2)
GND 4 13 SW
17
SW Voltage (Note 3) .................................. 0.4V to 50V
GND
MODE 5 12 DCHRG
V V Voltage ............................................200mV
IN CELL
RTMR 6 11 V
SNS
V V Voltage .............................................200mV
IN SNS D 7 10 V
IN CELL
MODE V Voltage .............................................200mV
OUT 8 9 V
IN IN
V , MODE Pin Current ........................................ 1mA
SNS
FE PACKAGE
16-LEAD PLASTIC TSSOP
V , OUT Pin Current ........................................ 10mA
CELL
T = 150C, = 38C/W
JMAX JA
SW Pin Negative Current ..........................................2A
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
Operating Junction Temperature Range (Note 4)
LT8584E ................................................. 40C to 125C
LT8584I.................................................. 40C to 125C
LT8584H ................................................ 40C to 150C
Storage Temperature Range .................. 65C to 150C
Lead Temperature (Soldering, 10 sec) ...................300C
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8584EFE#PBF LT8584EFE#TRPBF 8584FE 16-Lead Plastic TSSOP 40C to 125C
LT8584IFE#PBF LT8584IFE#TRPBF 8584FE 16-Lead Plastic TSSOP 40C to 125C
LT8584HFE#PBF LT8584HFE#TRPBF 8584FE 16-Lead Plastic TSSOP 40C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: