LTC6801
Independent Multicell
Battery Stack Fault Monitor
FEATURES
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DESCRIPTION
The
LTC
®
6801
is a multicell battery monitoring IC in-
corporating a 12-bit ADC, a precision voltage reference,
sampled comparator, and a high voltage input multiplexer.
The LTC6801 can monitor as many as 12 series con-
nected battery cells for overvoltage, undervoltage, and
overtemperature conditions, indicating whether the cells
are within specified parameters. The LTC6801 generates
a clock output when no fault conditions exist. Differential
clocking provides high noise immunity and ensures that
battery stack fault conditions cannot be hidden by frozen
bits or short circuit conditions.
Each LTC6801 can operate with a battery stack voltage up
to 60V and multiple LTC6801 devices can be stacked to
monitor each individual cell in a long battery string. When
multiple devices are stacked, the status signal of each
LTC6801 can be daisy-chained, without opto-couplers or
isolators, providing a single status output for the entire
battery string.
The LTC6801 is configurable by external pin strapping.
Adjustable overvoltage and undervoltage thresholds sup-
port various Li-Ion chemistries. Selectable measurement
times allow users to save power.
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Monitors Up to 12 Li-Ion Cells in Series (60V Max)
Stackable Architecture Enables > 1000V Systems
1% Maximum Overvoltage Detection Level Error
Adjustable Overvoltage and Undervoltage Detection
Self Test Features Guarantee Accuracy
Robust Fault Detection Using Differential Signals
Simple Pin-Strapped Configuration Allows Battery
Monitoring without a Microcontroller
15.5ms to Monitor All Cells in a System
Programmable Response Time
Two Temperature Monitor Inputs
Low Power Idle Mode
36-Lead SSOP Package
APPLICATIONS
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Redundant Battery Monitor
Hybrid Electric Vehicles
Battery Backup Systems
Power Systems Using Multiple Battery Cells
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BLOCK DIAGRAM
NEXT HIGHER
CELL PACK
1 V+
2
3
C12
C11
CONTROL
LOGIC
ENABLE
INPUT
ISOLATION
20
CLOCK SIGNAL
INPUT ENABLES
THE LTC6801
ERROR (%)
LTC6801
0V Detection Level Error
1.0
V
+
= 43.2V
0.8 OV = 4.116V
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 TA01b
5 TYPICAL UNITS
12
13
14
NEXT LOWER
CELL PACK
C2
C1
V–
MUX
ADC
12
“CELLS GOOD”
V
TEMP1
15
V
TEMP2
16
NTC
V
REF
17
REFERENCE
STATUS
OUTPUT
22
CLOCK SIGNAL
OUTPUT INDICATES
SYSTEM “OK”
6801 TA01a
NTC
6801fc
For more information
www.linear.com/LTC6801
1
LTC6801
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
V
+
C12
C11
C10
C9
C8
C7
C6
C5
1
2
3
4
5
6
7
8
9
36 OV1
35 OV0
34 UV1
33 UV0
32 HYST
31 CC1
30 CC0
29
SLT
28 SLTOK
27 DC
26 EOUT
25
EOUT
24 SIN
23
SIN
22 SOUT
21
SOUT
20 EIN
19
EIN
Total Supply Voltage (V
+
to V
–
) .................................60V
Input Voltage (Relative to V
–
)
C1 ............................................................ –0.3V to 9V
C12 ...........................................V
+
–0.3V to V
+
+ 0.3V
All Other Pins (Not C Inputs) ................... –0.3V to 7V
Voltage Between Inputs
Cn to Cn-1* .............................................. –0.3V to 9V
C12 to C8 ............................................... –0.3V to 25V
C8 to C4 ................................................. –0.3V to 25V
C4 to V
–
................................................. –0.3V to 25V
Operating Temperature Range
LTC6801I .............................................–40°C to 85°C
LTC6801H .......................................... –40°C to 125°C
Specified Temperature Range
LTC6801I .............................................–40°C to 85°C
LTC6801H .......................................... –40°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
*n = 2 to 12
C4 10
C3 11
C2 12
C1 13
V
–
14
VTEMP1 15
VTEMP2 16
VREF 17
VREG 18
G PACKAGE
36-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 70°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC6801IG#PBF
LTC6801HG#PBF
TAPE AND REEL
LTC6801IG#TRPBF
LTC6801HG#TRPBF
PART MARKING*
LTC6801G
LTC6801G
PACKAGE DESCRIPTION
36-Lead Plastic SSOP
36-Lead Plastic SSOP
SPECIFIED TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°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
6801fc
For more information
www.linear.com/LTC6801
LTC6801
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
+
= 43.2V, V
–
= 0V unless otherwise noted.
SYMBOL
V
ERR
PARAMETER
Overvoltage (OV) or Undervoltage (UV)
Detection Level Error
CONDITIONS
(Note 2)
2.106V ≤ V
CELL
≤ 4.498V
2.106V ≤ V
CELL
≤ 4.498V
1.531V ≤ V
CELL
< 2.106V
1.531V ≤ V
CELL
< 2.106V
V
CELL
= 0.766V
V
CELL
= 0.766V
V
ERR
Specifications Met
Full Scale Voltage Range
V
ERR
Specifications Met
Range of Inputs Cn, n = 3 to 11
Range of Input C2
Range of Input C1
10V < V
+
< 50V
10V < V
+
< 50V
V
REF
Pin Loaded With 100k to V
–
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX
UNITS
DC Specifications
–0.8
–1
–1
–1.3
–1.5
–2
10
5
1.8
1.2
0
–13
–25
3.043
3.038
3.058
3.058
8
50
60
10V < V
S
< 50V, No Load
LTC6801IG
LTC6801HG
10V < V
S
< 50V, I
LOAD
= 4mA
LTC6801IG
LTC6801HG
In/Out of Pins C1 Thru C12
When Measuring Cells During Self Test
When Measuring Cells
When Idle
Current Into the V
+
Pin While Monitoring
for UV and OV Conditions, F
ENA
= 10kHz
Continuous Monitoring
Continuous Monitoring
Monitor Every 130ms (Note 3)
Monitor Every 500ms (Note 3)
Current into the V
+
Pin When Idle, F
ENA
= 0
LTC6801IG
l
l
l
l
l
l
l
l
l
l
0.8
1
1
1.3
1.5
2
50
%
%
%
%
%
%
V
V
V
S
V
CELL
V
CM
Supply Voltage, V
+
Relative to V
–
Cell Voltage Range
Common Mode Voltage Range Measured
Relative to V
–
5•n
10
5
17
25
3.073
3.078
V
V
V
mV
%
V
V
ppm/˚C
ppm
ppm/√khr
V
TV
HYS
V
REF
Temperature Input Detection Level Error
(Relative to V
REF
/2)
UV/OV Detection Hysteresis Error
(Relative to Selected Value)
Reference Pin Voltage
Reference Voltage Temperature Coefficient
Reference Voltage Hysteresis
Reference Voltage Long Term Drift
V
REG
Regulator Pin Voltage
4.5
4.5
4.1
4.1
5
5
5
4.8
4.8
9
100
1
5.5
5.7
V
V
V
V
mA
µA
µA
nA
Regulator Pin Short Circuit Current Limit
I
B
Input Bias Current
l
–10
10
I
M
Supply Current, Monitor Mode
l
l
l
600
500
110
50
23
20
23
20
13
2
25
40
750
750
200
100
30
30
30
30
15.5
1000
1100
320
160
42
45
42
48
19
40
500
60
µA
µA
µA
µA
µA
µA
µA
µA
ms
kHz
µs
%
6801fc
I
QS
Supply Current, Idle
LTC6801HG
l
LTC6801 Timing Specifications
T
CYCLE
F
ENA
T
ENA
DC
ENA
Measurement Cycle Time
Valid EIN/EIN Frequency
Valid EIN/EIN Period = 1/ F
ENA
Valid EIN/EIN Duty Cycle
F
ENA
= 40kHz
DC = CC1 = CC0 = V
REG
l
l
l
l
For more information
www.linear.com/LTC6801
3
LTC6801
The
specifications which apply over
ELECTRICAL CHARACTERISTICS
25°C, V
l
+
denotes the = 0V unless otherwise noted. the full operating
–
temperature range, otherwise specifications are at T =
= 43.2V, V
A
SYMBOL
V
IH
V
IL
V
ODL
V
OH
V
OL
I
PU-ST
V
IDH
V
IDL
V
IL
V
IH
V
DHYS
V
OPEN
R
INCM
R
INDIFF
V
ODH
V
ODL
V
3IH
V
3IM
V
3IL
I
PU
I
PD
PARAMETER
Digital Input Voltage High
Digital Input Voltage Low
Digital Output Voltage Low, Open Drain
Digital Output Voltage High
Digital Output Voltage Low
Pull-Up Current
Minimum Differential Input Voltage High
Minimum Differential Input Voltage Low
Valid Input Voltage Low
Valid Input Voltage High
Differential Input Hysteresis
Open Circuit Voltage
Input Resistance, Common Mode
Input Resistance, Differential
Digital Output Voltage High
Digital Output Voltage Low
Three-Level Digital Input Voltage High
Three-Level Digital Input Voltage Mid
Three-Level Digital Input Voltage Low
Pull-Up Current
Pull-Down Current
CONDITIONS
SLT
Pin
SLT
Pin
SLT
Pin, 10k to V
REG
SLTOK Pin, 10k to V
–
SLTOK Pin, 10k to V
REG
SLT
Pin
Differential Voltage Applied Between SIN
and
SIN
or EIN and
EIN
Low Side of Differential Signal, Ref. to V
–
High Side of Differential Signal, Ref. to V
–
l
l
l
l
l
l
MIN
2
TYP
MAX
UNITS
V
LTC6801 Single Ended Digital I/O Specifications (SLT, SLTOK Pins)
0.5
0.3
V
REG
– 0.3
0.3
2.5
1.7
–1.7
0
2.5
1
l
l
V
V
V
V
µA
V
V
V
V
V
V
kΩ
kΩ
V
5
10
LTC6801 Differential Digital Input Specifications (SIN/SIN, EIN/EIN Pins) (See Figure 1)
l
l
l
l
1.2
6
2.5
150
300
3
2
100
200
Between SIN to
SIN,
EIN to
EIN
Output Pins Loaded With 100k to V
–
Output Pins Loaded With 100k to V
REG
l
LTC6801 Differential Digital Output Specifications (SOUT/SOUT, EOUT/EOUT Pins)
l
V
REG
– 0.4
l
0.4
V
V
LTC6801 Three-Level Digital Input Specifications (OV0, OV1, UV0, UV1, HYST, DC, CC0 and CC1 Pins)
l
V
REG
– 0.3
l
V
REF
– 0.3
l
V
REF
+ 0.3
0.3
1
1
2
2
V
V
µA
µA
Pins DC, CC0, CC1, UV0 and UV1
Pins HYST, OV0 and OV1
l
l
0.5
0.5
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:
V
CELL
refers to the voltage applied across the following pin
combinations: Cn to Cn – 1 for n = 2 to 12, C1 to V
–
.
Note 3:
Guaranteed by continuous monitoring supply current
specifications, not subject to test.
EIN
MAX, V
IH
V
IDH
(VALID HIGH WHEN
EIN –
EIN
≥ V
IDH
)
T
ENA
MIN, V
IH
MAX, V
IL
EIN
V
IDL
(VALID LOW WHEN EIN –
EIN
≤ V
IDL
)
6801 F01
V– = 0V
Figure 1. Differential Input Specifications
4
6801fc
For more information
www.linear.com/LTC6801
LTC6801
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current, Monitor Mode
800
DC PIN TIED TO V
REG
780 f
ENA
= 10kHz
760
740
I
SUPPLY
(µA)
I
SUPPLY
(µA)
720
700
680
660
640
620
600
10
20
30
40
50
60
6801 G01
Supply Current, Monitor Mode
250
CC1 = CC0 = V
REG
f
ENA
= 10kHz
40
35
30
DC PIN = V
REF
25
20
15
10
85°C
25°C
–40°C
10
20
30
V
+
(V)
40
50
60
6801 G02
Supply Current, Idle Mode
85°C
200
25°C
85°C
–40°C
I
SUPPLY
(µA)
25°C
150
100
DC PIN = V
–
–40°C
50
5
0
10
20
30
40
50
60
6801 G03
0
V
+
(V)
V
+
(V)
Supply Current, Monitor Mode
800
DC PIN TIED TO V
REG
780 f
ENA
= 10kHz
760
740
I
SUPPLY
(µA)
I
SUPPLY
(µA)
720
700
680
660
640
620
600
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 G04
Supply Current, Monitor Mode
250
CC1 = CC0 = V
REG
f
ENA
= 10kHz
40
35
30
I
SUPPLY
(µA)
DC PIN = V
REF
25
20
15
10
V
+
= 60V
V
+
= 35V
V
+
= 10V
5
Supply Current, Idle Mode
V
+
= 60V
200
V
+
= 60V
V
+
= 35V
V
+
= 10V
150
V
+
= 35V
V = 10V
+
100
DC PIN = V
–
50
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 G05
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 G06
UV Detection Level Error
1.0
V
+
= 43.2V
0.8 UV = 2.106V
0.6
0.4
ERROR (%)
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 G07
0V Detection Level Error
1.0
V
+
= 43.2V
0.8 OV = 4.116V
800
Supply Current
V
+
= 43.2V
780 CONTINUOUS MEAS MODE
5 TYPICAL UNITS
ERROR (%)
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
5 TYPICAL UNITS
I
SUPPLY
(µA)
760
740
720
700
680
660
640
620
600
1
85°C
25°C
–40°C
–1.0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
6801 G08
10
f
ENA
(kHz)
100
6801 G09
6801fc
For more information
www.linear.com/LTC6801
5
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