Can Be Paralleled for Greater Discharge Capability
All Quiescent Current in Operation Taken from Local Cell
16-Lead TSSOP Package
LT8584
2.5A Monolithic Active Cell
Balancer with Telemetry Interface
DescripTion
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.
applicaTions
n
n
n
n
Active Battery Stack Balancing
Electric and Hybrid Electric Vehicles
Fail-Safe Power Supplies
Energy Storage Systems
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
MODULE
+
V
+
LTC6804
BATTERY STACK
MONITOR
C12
S12
MEASURABLE CELL
PARAMETERS
• V
CELL
• I
DISCHARGE
• V
REF
• TEMPERATURE
2.5A AVERAGE
DISCHARGE
•
•
LT8584
+
BAT 12
MODULE
–
READ CELL PARAMETERS
ENABLE BALANCING
2.5A AVERAGE
DISCHARGE
MODULE
+
•
•
LT8584
ENABLE BALANCING
MODULE
–
• R
CABLE
+ R
CONNECTOR
• SWITCHING FAULTS
• UNDERVOLTAGE
• SERIAL FAULTS
• COULOMB COUNTING
+
BAT 2
READ CELL PARAMETERS
C2
S2
EXTRACTABLE CELL
PARAMETERS
2.5A AVERAGE
DISCHARGE
MODULE
+
•
•
LT8584
ENABLE BALANCING
MODULE
–
+
BAT 1
READ CELL PARAMETERS
C1
S1
V
–
/C0
LT8584 TA01a
MODULE
–
8584fb
For more information
www.linear.com/LT8584
1
LT8584
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
GND
GND
GND
GND
MODE
RTMR
D
IN
OUT
1
2
3
4
5
6
7
8
17
GND
16 SW
15 SW
14 SW
13 SW
12 DCHRG
11 V
SNS
10 V
CELL
9
V
IN
D
IN
to GND Voltage ................................................. ±10V
V
IN
, V
CELL
, V
SNS,
MODE, OUT,
DCHRG Voltage ............................................ –0.3V to 9V
RTMR Voltage .................................................... (Note 2)
SW Voltage (Note 3) .................................. –0.4V to 50V
V
IN
– V
CELL
Voltage ............................................±200mV
V
IN
– V
SNS
Voltage .............................................±200mV
MODE – V
IN
Voltage .............................................200mV
V
SNS
, MODE Pin Current ........................................ ±1mA
V
CELL
, OUT Pin Current ........................................ ±10mA
SW Pin Negative Current ..........................................–2A
Operating Junction Temperature Range (Note 4)
LT8584E................................................. –40°C to 125°C
LT8584I.................................................. –40°C to 125°C
LT8584H ................................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT8584EFE#PBF
LT8584IFE#PBF
LT8584HFE#PBF
TAPE AND REEL
LT8584EFE#TRPBF
LT8584IFE#TRPBF
LT8584HFE#TRPBF
PART MARKING*
8584FE
8584FE
8584FE
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
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:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
8584fb
For more information
www.linear.com/LT8584
LT8584
elecTrical characTerisTics
PARAMETER
V
IN
Recommended Voltage Range
V
IN
Quiescent Current
CONDITIONS
Switching
Nonswitching
Switching
Nonswitching
In Shutdown, D
IN
= OUT
In Shutdown, D
IN
= OUT
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V, D
IN
= GND unless otherwise noted. (Note 4)
MIN
2.5
2.45
45
2.5
1
2.1
6
6.3
450
I
SW
= 4A
V
SW
= 4.2V
V
SW
= 4.2V
Note 5
I
SW
= 2mA
I
SW
= 6A
Note 6
V
SW
– V
VIN
200mV Overdrive
l
l
l
l
l
TYP
MAX
5.3
5.3
3
90
1
2.45
6.8
UNITS
V
mA
mA
nA
µA
V
A
ns
mV
V
IN
UVLO
Switch DC Current Limit
Current Limit Blanking Time
Switch V
CESAT
Switch Leakage Current
Switch Maximum On Time
Switch Short Detection Timeout
Switch Clamp Voltage
Switch Clamp Blanking Time
DCM Comparator Trip Voltage
DCM Comparator Propagation Delay
DCM Blanking Time
MODE Threshold
D
IN
Shutdown Threshold
D
IN
Shutdown Threshold Hysteresis
D
IN
Data Threshold
D
IN
Data Threshold Hysteresis
D
IN
Pin Current
DCHRG Threshold
DCHRG Hysteresis
DCHRG Pull-down Current
DCHRG Pull-up Current
RMTR Pin High Voltage
RMTR Pin Low Voltage
V
CELL
Switch R
DSON
V
SNS
Dynamic Input Range
V
SNS
Average Input Range
V
SNS
Amplifier Input Referred Offset
V
SNS
Amplifier Gain
Handshake Voltage Error
Gain Error ≤ 8%
Gain Error ≤ 3%
V
CELL
– V
SNS
= 40mV
Over V
SNS
Average Input Range
Measured ± with Respect to:
V
MODE1
= 0.2V
V
MODE2
= 0.4V
V
MODE3
= 0.6V
V
MODE4
= 0.8V
V
SW,ERR
= 1.2V
V
FAULT
= 1.4V
V
FAULT
= 1.4V
High
→
Low, V
TH
= V
OUT
– V
DIN
, MODE = 0V
V
TH
= V
OUT
– V
DIN
, MODE = 0V
V
DIN
= 0V
V
DIN
= –1V
MODE Tied to V
IN
MODE Tied to V
IN
Pin Voltage = 0.4V
Pin Voltage = V
IN
– 0.4V
R
RTMR
= 50kΩ
R
RTMR
= 50kΩ
High
→
Low, Referred to GND
200
5
30
0.5
42
80
40
50
0.85
45
50
200
95
100
230
1.7
l
70
4
70
1.2
48
360
150
180
nA
µA
µs
µs
V
V
ns
mV
ns
ns
V
1
0.3
20
–6
–18
0.5
220
220
1.2
100
0.7
80
–3
–14
0.8
100
300
300
1.22
0
55
1.4
0.9
160
–1
–6
1.1
V
mV
V
mV
µA
µA
V
mV
µA
µA
V
V
Ω
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
–30
15
–1.1
18.7
–13
–14
–18
–22
–31
–35
–28
19
70
45
1.1
19.3
13
14
18
22
31
35
28
mV
mV
mV
V/V
mV
mV
mV
mV
mV
mV
mV
8584fb
For more information
www.linear.com/LT8584
3
LT8584
elecTrical characTerisTics
PARAMETER
Handshake Voltage Line Regulation
V
TEMP
Temperature Coefficient (TC)
V
TEMP
OUT Pin Clamp Voltage
OUT Pin Amplifier Load Regulation
CONDITIONS
From V
VIN
= 2.5V to V
VIN
= 4.2V
Note 7, °K = (V
CELL
– V
TEMP
)/TC
V
TEMP
= V
IN
– V
OUT
, T
J
= 25°C
10mA Sourced from Pin
I
OUT
= 10µA to 1mA
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V, D
IN
= GND unless otherwise noted. (Note 4)
MIN
TYP
0.2
2
0.658
1.53
0
1.6
0.2
0.4
MAX
0.75
UNITS
%/V
mV/°K
V
V
%/mA
TiMing characTerisTics
SYMBOL
t
W
PARAMETER
Decode Window Duration
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. MODE = 0V. Refer to Timing Diagram for parameter definition. (Note 4)
CONDITIONS
R
RTMR
= 10kΩ
R
RTMR
= 50kΩ
R
RTMR
= 100kΩ
R
RTMR
= 200kΩ
l
l
l
l
l
l
MIN
1.76
8
15.6
29.3
1.76
10
TYP
1.86
8.4
16.4
31.5
MAX
1.96
8.8
17.2
33.7
33.7
UNITS
ms
ms
ms
ms
ms
µs
µs
µs
µs
µs
Decode Window Range
t
RST
t
1
t
2
t
3
t
4
t
5
t
6
SR
D
IN
Serial Communication Reset Time
RTMR Start-Up Time
D
IN
Hold-Off Time
D
IN
High Time
D
IN
Low Time
Discharger Activation Time
Discharger Deactivation Time
D
IN
Slew Rate
R
RTMR
= 10kΩ
R
RTMR
= 10kΩ
l
l
l
l
1.8
50
50
50
900
2.1
5
ns
µs
V/ms
l
9
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device reliability
and lifetime.
Note 2:
Do not apply a positive or negative voltage or current source to
RTMR, otherwise permanent damage may occur.
Note 3:
ABSMAX rating refers to the maximum DC + AC leakage spike. Do
not exceed 40V
DC
on any of the SW pins.
Note 4:
The LT8584E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT8584I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8584H is guaranteed over the full –40°C to
150°C operating junction temperature range.
Note 5:
This is a measure of time duration from the onset of the switch
turning on to the time the short-circuit protection circuit is disabled. If the
current comparator trips during this duration, the switch error latch is set.
This indicates that the connection to the transformer primary is most likely
shorted.
Note 6:
This is a measure of time duration for the switch clamp to operate
continuously without setting the switch error latch. If the switch clamp
remains engaged longer than the switch clamp blanking time, the switch
error latch is set and switching is disabled.
Note 7:
The voltage proportional to temperature (V
TEMP
) is measured
on the OUT pin while in analog multiplexer MODE 3 or 4. V
TEMP
must be
subtracted from the V
CELL
voltage that is measured while in analog mux
MODE 1. Both measurements should be taken within 100ms of each other
to reduce errors in absolute temperature calculation.
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