toring IC that includes a 12-bit ADC, a precision voltage
reference, a high voltage input multiplexer and a serial
interface. Each LTC6803 can measure up to 12 series
connected battery cells or supercapacitors. Many LTC6803
devices can be stacked to measure the voltage of each cell
in a long battery string. Each LTC6803-2/LTC6803-4 has
an individually addressable serial interface, allowing up
to 16 LTC6803-2/LTC6803-4 devices to interface to one
control processor and operate simultaneously. Each cell
input has an associated MOSFET switch for discharging
overcharged cells. The LTC6803-2 connects the bottom
of the stack to V
–
internally. It is pin compatible with the
LTC6802-2, providing a drop-in upgrade. The LTC6803-4
separates the bottom of the stack from V
–
, improving
cell 1 measurement accuracy.
The LTC6803 provides a standby mode to reduce supply
current to 12µA. Furthermore, the LTC6803 can be powered
from an isolated supply, providing a technique to reduce
battery stack current draw to zero.
The related LTC6803-1 and LTC6803-3 offer a serial in-
terface that allows the serial ports of multiple LTC6803-1
or LTC6803-3 devices to be daisy chained without opto-
couplers or isolators.
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.
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Measures Up to 12 Battery Cells in Series
Stackable Architecture
Supports Multiple Battery Chemistries
and Supercapacitors
Individually Addressable Serial Interface
0.25% Maximum Total Measurement Error
Engineered for ISO26262 Compliant Systems
13ms to Measure All Cells in a System
Passive Cell Balancing:
– Integrated Cell Balancing MOSFETs
– Ability to Drive External Balancing MOSFETs
Onboard Temperature Sensor and Thermistor Inputs
1MHz Serial Interface with Packet Error Checking
Safe with Random Connection of Cells
Built-In Self Tests
Delta-Sigma Converter With Built-In Noise Filter
Open-Wire Connection Fault Detection
12µA Standby Mode Supply Current
High EMI Immunity
44-Lead SSOP Package
APPLICATIONS
n
n
n
n
Electric and Hybrid Electric Vehicles
High Power Portable Equipment
Backup Battery Systems
Electric Bicycles, Motorcycles, Scooters
TYPICAL APPLICATION
NEXT 12-CELL
PACK ABOVE
V
+
LTC6803-4
DIE TEMP
REGISTERS
AND
CONTROL
SERIAL
DATA
4-BIT
ADDRESS
Supply Current vs Modes of Operation
1mA
100µA
+
MUX
+
+
12-BIT
∆Σ
ADC
VOLTAGE
REFERENCE
SUPPLY CURRENT
12-CELL
BATTERY OR
CAPACITOR
STRING
50V
ISOLATED
DC/DC
CONVERTER
12V
10µA
1µA
100nA
10nA
1nA
NEXT 12-CELL
PACK BELOW
V
–
100k NTC
EXTERNAL
TEMP
100k
680324 TA01a
HW
SHUTDOWN
STANDBY
MEASURE
680324 TA01b
680324fa
1
LTC6803-2/LTC6803-4
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V
+
to V
–
) .................................75V
Input Voltage (Relative to V
–
)
C0 ............................................................ –0.3V to 8V
C12 ........................................................ –0.3V to 75V
Cn (Note 5) ......................... –0.3V to Min (8 •
n,
75V)
Sn (Note 5) ......................... –0.3V to Min (8 •
n,
75V)
All Other Pins ........................................... –0.3V to 7V
Voltage Between Inputs
Cn to Cn – 1 ............................................. –0.3V to 8V
Sn to Cn – 1 ............................................. –0.3V to 8V
C12 to C8 ............................................... –0.3V to 25V
C8 to C4 ................................................. –0.3V to 25V
C4 to C0 ................................................. –0.3V to 25V
Operating Temperature Range
LTC6803I .............................................–40°C to 85°C
LTC6803H .......................................... –40°C to 125°C
Specified Temperature Range
LTC6803I .............................................–40°C to 85°C
LTC6803H .......................................... –40°C to 125°C
Junction Temperature ........................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Note:
n
= 1 to 12
PIN CONFIGURATION
LTC6803-2
V
+
C12
S12
C11
S11
C10
S10
C9
S9
1
2
3
4
5
6
7
8
9
TOP VIEW
44 CSBI
43 SDO
42 SDI
41 SCKI
40 A3
39 A2
38 A1
37 A0
36 GPIO2
35 GPIO1
34 WDTB
33 NC
32 TOS
31 V
REG
30 V
REF
29 V
TEMP2
28 V
TEMP1
27 NC
26 V
–
25 S1
24 C1
23 S2
LTC6803-4
V
+
C12
S12
C11
S11
C10
S10
C9
S9
1
2
3
4
5
6
7
8
9
TOP VIEW
44 CSBI
43 SDO
42 SDI
41 SCKI
40 A3
39 A2
38 A1
37 A0
36 GPIO2
35 GPIO1
34 WDTB
33 TOS
32 V
REG
31 V
REF
30 V
TEMP2
29 V
TEMP1
28 NC
27 V
–
26 C0
25 S1
24 C1
23 S2
C8 10
S8 11
C7 12
S7 13
C6 14
S6 15
C5 16
S5 17
C4 18
S4 19
C3 20
S3 21
C2 22
C8 10
S8 11
C7 12
S7 13
C6 14
S6 15
C5 16
S5 17
C4 18
S4 19
C3 20
S3 21
C2 22
G PACKAGE
44-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 70°C/W
G PACKAGE
44-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 70°C/W
680324fa
2
LTC6803-2/LTC6803-4
ORDER INFORMATION
LEAD FREE FINISH
LTC6803IG-2#PBF
LTC6803IG-4#PBF
LTC6803HG-2#PBF
LTC6803HG-4#PBF
TAPE AND REEL
LTC6803IG-2#TRPBF
LTC6803IG-4#TRPBF
LTC6803HG-2#TRPBF
LTC6803HG-4#TRPBF
PART MARKING*
LTC6803G-2
LTC6803G-4
LTC6803G-2
LTC6803G-4
PACKAGE DESCRIPTION
44-Lead Plastic SSOP
44-Lead Plastic SSOP
44-Lead Plastic SSOP
44-Lead Plastic SSOP
SPECIFIED TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS
SYMBOL
V
S
V
LSB
PARAMETER
Supply Voltage, V
+
Relative to V
–
Measurement Resolution
ADC Offset
ADC Gain Error
V
ERR
Total Measurement Error
DC Specifications
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.
CONDITIONS
V
ERR
Specification Met
Timing Specification Met
Quantization of the ADC
(Note 2)
(Note 2)
l
l
l
l
l
MIN
10
4
TYP
MAX
55
55
UNITS
V
V
mV/Bit
mV
%
%
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
°C
1.5
–0.5
–0.12
–0.22
±2.5
0.5
0.12
0.22
(Note4)
V
CELL
= –0.3V
V
CELL
= 2.3V
V
CELL
= 2.3V
V
CELL
= 3.6V
V
CELL
= 3.6V, LTC6803IG
V
CELL
= 3.6V, LTC6803HG
V
CELL
= 4.2V
V
CELL
= 4.2V, LTC6803IG
V
CELL
= 4.2V, LTC6803HG
V
CELL
= 5V
2.3V < V
TEMP
< 4.2V, LTC6803IG
2.3V < V
TEMP
< 4.2V, LTC6803HG
Full-Scale Voltage Range
Range of Inputs Cn < 0.25% Gain Error,
n
= 2 to 11, LTC6803IG
Range of Inputs C0, C1 < 0.25% Gain Error,
LTC6803IG
Range of Inputs Cn < 0.5% Gain Error,
n
= 2 to 11, LTC6803HG
Range of Inputs C0, C1 < 0.5% Gain Error,
LTC6803HG
l
l
l
l
l
l
l
–2.8
–5.1
–4.3
–7.9
–9
–5
–9.2
–10
–9.2
–10
–0.3
1.8
0
1.8
0
±3
2.8
5.1
4.3
7.9
9
5
9.2
10
9.2
10
5
5•
n
5
5•
n
5
V
CELL
V
CM
Cell Voltage Range
Common Mode Voltage Range
Measured Relative to V
–
l
l
l
l
Die Temperature Measurement Error
Error in Measurement of 125°C
5
680324fa
3
LTC6803-2/LTC6803-4
ELECTRICAL CHARACTERISTICS
SYMBOL
V
REF
PARAMETER
Reference Pin Voltage
Reference Voltage Temperature
Coefficient
Reference Voltage Thermal Hysteresis 25°C to 85°C and 25°C to –40°C
Reference Voltage Long-Term Drift
V
REF2
V
REG
2nd Reference Voltage
l
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.
CONDITIONS
R
LOAD
= 100k to V
–
l
MIN
3.020
3.015
TYP
3.065
3.065
8
100
60
MAX
3.110
3.115
UNITS
V
V
ppm/°C
ppm
ppm/√kHr
2.25
2.1
4.5
4.5
8
–10
2.5
2.5
5.0
5.0
2.75
2.9
5.5
V
V
V
V
mA
Regulator Pin Voltage
Regulator Pin Short-Circuit Limit
10V < V
+
< 50V, No Load
I
LOAD
= 4mA
In/Out of Pins C1 Through C12
When Measuring Cell
When Not Measuring Cell
Current Into the V
+
Pin When Measuring
Continuous Measuring (CDC = 2)
Continuous Measuring (CDC = 2)
Measure Every 130ms (CDC = 5)
Measure Every 500ms (CDC = 6)
Measure Every 2 Seconds (CDC = 7)
l
l
l
I
B
I
S
Input Bias Current
1
780
780
250
175
70
12
12
12
0.001
10
µA
nA
µA
µA
µA
µA
µA
µA
µA
µA
µA
Ω
µA
°C
°C
Supply Current, Measure Mode
(Note 7)
l
l
l
l
620
600
190
140
55
8
1000
1150
360
250
105
16.5
18
19
1
20
I
QS
Supply Current, Standby
Current Into V
+
Pin When In Standby, All Serial
Port Pin at Logic “1”
LTC6803IG
LTC6803HG
Current Out of V
–
, V
C12
= 43.2V, V
+
Floating
(Note 8)
V
CELL
> 3V (Note 3)
l
l
l
l
l
6
6
I
SD
Supply Current, Hardware Shutdown
Discharge Switch-On Resistance
10
70
110
145
5
I
OW
Current Used for Open-Wire Detection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
140
Voltage Mode Timing Specifications
t
CYCLE
Measurement Cycling
Time Required to Measure 12 Cells
Time Required to Measure 10 Cells
Time Required to Measure 3 Temperatures
Time Required to Measure 1 Cell or Temperature
l
l
l
l
l
l
l
l
l
l
l
l
l
l
11
9
2.8
1.0
10
250
400
400
400
100
100
13
11
3.4
1.2
15
13
4.1
1.4
ms
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
SDI Valid to SCKI Rising Setup
SDI Valid to SCKI Rising Hold
SCKI Low
SCKI High
CSBI Pulse Width
CSBI Falling to SCKI Rising
CSBI Falling to SDO Valid
SCKI Falling to SDO Valid
Clock Frequency
Watchdog Timer Timeout Period
250
1
1
2.5
ns
MHz
Seconds
680324fa
4
LTC6803-2/LTC6803-4
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IH
V
IL
V
OL
I
IN
PARAMETER
Digital Input Voltage High
Digital Input Voltage Low
Digital Output Voltage Low
Digital Input Current
Voltage Mode Digital I/O
Pins SCKI, SDI and CSBI
Pins SCKI, SDI and CSBI
Pin SDO, Sinking 500µA
V
MODE
, TOS, SCKI, SDI, CSBI
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
+
= 43.2V, V
–
= 0V, unless otherwise noted.
CONDITIONS
MIN
2
0.8
0.3
10
TYP
MAX
UNITS
V
V
V
µA
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:
The ADC specifications are guaranteed by the Total Measurement
Error (V
ERR
) specification.
Note 3:
Due to the contact resistance of the production tester, this
specification is tested to relaxed limits. The 20Ω limit is guaranteed by
design.
Note 4:
V
CELL
refers to the voltage applied across Cn to Cn – 1 for
n
= 1 to 12. V
TEMP
refers to the voltage applied from V
TEMP1
or V
TEMP2
to V
–
.
Note 5:
These absolute maximum ratings apply provided that the voltage
between inputs do not exceed the absolute maximum ratings.
Note 6:
Supply current is tested during continuous measuring. The supply
current during periodic measuring (130ms, 500ms, 2s) is guaranteed by
design.
Note 7:
The CDC = 5, 6 and 7 supply currents are not measured. They are
guaranteed by the CDC = 2 supply current measurement.
Note 8:
Limit is determined by high speed automated test capability.
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