LTC6801
Independent Multicell
Battery Stack Fault Monitor
FEATURES DESCRIPTION
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Monitors Up to 12 Li-Ion Cells in Series (60V Max)
The LTC 6801 is a multicell battery monitoring IC in-
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Stackable Architecture Enables > 1000V Systems
corporating a 12-bit ADC, a precision voltage reference,
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1% Maximum Overvoltage Detection Level Error
sampled comparator, and a high voltage input multiplexer.
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Adjustable Overvoltage and Undervoltage Detection
The LTC6801 can monitor as many as 12 series con-
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Self Test Features Guarantee Accuracy
nected battery cells for overvoltage, undervoltage, and
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Robust Fault Detection Using Differential Signals
overtemperature conditions, indicating whether the cells
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Simple Pin-Strapped Configuration Allows Battery
are within specified parameters. The LTC6801 generates
Monitoring without a Microcontroller
a clock output when no fault conditions exist. Differential
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15.5ms to Monitor All Cells in a System
clocking provides high noise immunity and ensures that
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Programmable Response Time
battery stack fault conditions cannot be hidden by frozen
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Two Temperature Monitor Inputs
bits or short circuit conditions.
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Low Power Idle Mode
Each LTC6801 can operate with a battery stack voltage up
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36-Lead SSOP Package
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
APPLICATIONS
LTC6801 can be daisy-chained, without opto-couplers or
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Redundant Battery Monitor
isolators, providing a single status output for the entire
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Hybrid Electric Vehicles
battery string.
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Battery Backup Systems
The LTC6801 is configurable by external pin strapping.
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Power Systems Using Multiple Battery Cells
Adjustable overvoltage and undervoltage thresholds sup-
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
port various Li-Ion chemistries. Selectable measurement
Technology Corporation. All other trademarks are the property of their respective owners.
times allow users to save power.
BLOCK DIAGRAM
0V Detection Level Error
NEXT HIGHER
LTC6801
CELL PACK
+
1
V 1.0
+
V = 43.2V
0.8
OV = 4.116V
C12
2
0.6
5 TYPICAL UNITS
C11
0.4
3
0.2
CONTROL
LOGIC
0
12
ADC
MUX
C2 0.2
ENABLE
12 ISOLATION
INPUT
0.4
20
CELLS GOOD
C1
13 CLOCK SIGNAL 0.6
INPUT ENABLES
0.8
THE LTC6801
V
14
1.0
40 25 10 5 20 35 50 65 80 95 110 125
TEMPERATURE (C)
22
NEXT LOWER 6801 TA01b
REFERENCE
STATUS
CELL PACK
CLOCK SIGNAL
V V V
TEMP1 TEMP2 REF
OUTPUT
OUTPUT INDICATES
15 16 17
SYSTEM OK
6801 TA01a
NTC
NTC
6801fc
1
For more information www.linear.com/LTC6801
ERROR (%)LTC6801
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
TOP VIEW
+
Total Supply Voltage (V to V ) .................................60V
+
V 1 36 OV1
Input Voltage (Relative to V )
C12 2 35 OV0
C1 ............................................................ 0.3V to 9V
C11 3 34 UV1
+ +
C12 ...........................................V 0.3V to V + 0.3V
C10 4 33 UV0
All Other Pins (Not C Inputs) ................... 0.3V to 7V
C9 5 32 HYST
Voltage Between Inputs
C8 6 31 CC1
Cn to Cn-1* .............................................. 0.3V to 9V
C7 7 30 CC0
C12 to C8 ............................................... 0.3V to 25V
C6 8 29 SLT
C8 to C4 ................................................. 0.3V to 25V C5 9 28 SLTOK
C4 10 27 DC
C4 to V ................................................. 0.3V to 25V
C3 11 26 EOUT
Operating Temperature Range
C2 12 25 EOUT
LTC6801I .............................................40C to 85C
C1 13 24 SIN
LTC6801H .......................................... 40C to 125C
V 14 23 SIN
Specified Temperature Range
V 15 22 SOUT
TEMP1
LTC6801I .............................................40C to 85C
V 16 21 SOUT
TEMP2
LTC6801H .......................................... 40C to 125C
V 17 20 EIN
REF
Junction Temperature ........................................... 150C
V 18 19 EIN
REG
Storage Temperature Range .................. 65C to 150C
G PACKAGE
36-LEAD PLASTIC SSOP
T = 150C, = 70C/W
*n = 2 to 12 JMAX JA
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LTC6801IG#PBF LTC6801IG#TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 85C
LTC6801HG#PBF LTC6801HG#TRPBF LTC6801G 36-Lead Plastic SSOP 40C to 125C
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: