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PDF LT8584 Data sheet ( Hoja de datos )
| Número de pieza | LT8584 | |
| Descripción | 2.5A Monolithic Active Cell Balancer | |
| Fabricantes | Linear | |
| Logotipo |  |
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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 (DIN) 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
2.5A AVERAGE
DISCHARGE
•
MODULE+
+
BAT 1
• MODULE–
LT8584
READ CELL PARAMETERS C1
S1
ENABLE BALANCING
MODULE–
EXTRACTABLE CELL
PARAMETERS
V–/C0
LT8584 TA01a
• VCELL
• IDISCHARGE
• VREF
• TEMPERATURE
• RCABLE + RCONNECTOR
• SWITCHING FAULTS
• UNDERVOLTAGE
• SERIAL FAULTS
• COULOMB COUNTING
For more information www.linear.com/LT8584
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1
1 page  
Typical Performance Characteristics
TA = 25°C, VIN = VCELL = VSNS = 4.2V, unless otherwise noted.
VSIwNitPcihninCgurDreisnatbled
2.6
DIN = 0V, PART ENABLED
VIN Pin Current
5
2.5 4
2.4
3
2.3
2
2.2
2.1 1
0.8
0.6
0.4
0.2
2.0
–60
–20 20 60 100
TEMPERATURE (°C)
140
8584 G01
0
2
46
PIN VOLTAGE (V)
0
8
8584 G02
LT8584
Total Input Leakage
IVIN + IVCELL + IVSNS + ISW
5
DIN = OUT
DCHRG = 0V
4 MODE = VIN
3
2
1
0
–60 –20
20
60 100 140
TEMPERATURE (°C)
8584 G03
VIN Internal UVLO
2.6
2.5
2.4
2.3
2.2
2.1
2.0
–60
–20 20
60 100
TEMPERATURE (°C)
140
8584 G04
Switch Current Limit
7.0
6.6
6.2
5.8
5.4
5.0
–60
–20 20
60 100
TEMPERATURE (°C)
140
8584 G05
Switch Characteristics
0.6
ISW = 5.8A
0.5
40
35
0.4 30
0.3 25
0.2
–60
–20 20 60 100
TEMPERATURE (°C)
20
140
8584 G06
Switch Maximum On-Time
50
Switch Clamp Voltage (ISW = 6A)
55
48 53
46 51
44 49
42 47
40
–60
–20 20 60 100
TEMPERATURE (°C)
140
8584 G07
45
–60
–20 20
60 100
TEMPERATURE (°C)
140
8584 G08
For more information www.linear.com/LT8584
DCM Comparator Threshold
130
110
90
70
50
–60
–20 20 60 100
TEMPERATURE (°C)
140
8584 G09
8584fb
5
5 Page 
Timing Diagram
LT8584
DIN
RTMR
tRST t2
t1
t3 t4
SR
tW
t6
DCHRG
t5 8584 TD
Operation
Many systems use multiple battery cells connected in se-
ries to increase the available capacity and voltage. In such
systems, the individual battery cells must be constantly
monitored to ensure that they operate within a controlled
range. Otherwise, the battery’s capacity and life span may
be compromised. Linear Technology offers the LTC680x
family series of multicell battery stack monitors (BSM) to
accomplish this task.
The LTC680x monitors each individual cell in the stack
and communicates this information through a proprietary
serial bus to a central processing unit. As a cell begins to
reach the upper charge limit, commands are issued to the
LTC680x to turn on that cell’s passive shunt, bypassing
the charging current to that cell and allowing the current to
continue to the rest of the cells. The passive shunt current
and/or power capability constrains the maximum charging
current for the battery stack. Using a passive shunt is also
inefficient, and the shunted current produces considerable
heat at higher charging currents.
The LT8584 solves the two limitations of passive shunting
balancers by actively shunting the charging current and
returning the energy back to the battery stack. Instead of
the energy being lost as heat, it is reused to charge the
rest of the batteries in the stack. The architecture of the
LT8584 also solves the problem of reduced run time when
one or more of the cells in the stack reaches the lower
safety voltage threshold before the entire stack capacity
is extracted. Only active balancing can redistribute the
charge from the stronger cells (cells with higher voltage)
to charge the weaker cells. This allows the weaker cells to
continue to supply the load, extracting greater than 96%
of entire stack capacity where passive balancing may only
extract 80%.
The LT8584 has an integrated 6A switch designed to operate
as a boundary mode flyback converter and provides 2.5A
average discharge current. The average discharge current
is also scalable by using multiple LT8584s to balance each
cell. Note that each battery in the stack requires an LT8584
active cell balancer.
The LT8584 flyback topology allows the charge to return
between any two points in the battery stack. Most applica-
tions use a module approach and return the charge to a
local set of 12 series-connected cells monitored by a 12
channel BSM IC, where the output of the flyback converter
is designated as VMODULE. The entire battery stack is then
constructed using several 12-cell modules connected in
series. A second approach is to return the charge to the
entire battery stack, where the flyback output is desig-
nated as VSTACK. A final option is to return the charge to
an auxiliary power rail, designated as VAUX.
The LT8584 has two modes of operation—selectable by
the MODE pin—that can be integrated with the LTC680x
or other battery stack system. In simple mode, the LT8584
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For more information www.linear.com/LT8584
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT8584.PDF ] | |
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