19-4584; Rev 1; 6/10
KIT
ATION
EVALU
BLE
AVAILA
12-Channel, High-Voltage
Battery-Pack Fault Monitors
General Description
Features
o
Up to 12-Cell Li+ Battery Voltage Fault Detection
o
Operation from 6.0V to 72V
o
Pin-Selectable Overvoltage Threshold from +3.3V
to +4.8V in 100mV Increments
±25mV Overvoltage-Detection Accuracy
o
Pin-Selectable Undervoltage Threshold from
+1.6V to +2.8V in 200mV Increments
±100mV Undervoltage-Detection Accuracy
o
Overvoltage/Undervoltage-Threshold Detection
Hysteresis
MAX11080: 300mV
MAX11081: 37.5mV
o
Programmable Delay Time of Alarm Detection
from 3.0ms to 3.32s with an External Capacitor
o
Daisy-Chained Alarm and Shutdown Functions
with Heartbeat Status Signal
Up to 31 Devices Can Be Connected
o
Ultra-Low-Power Dissipation
Operating-Mode Current Drain: 80µA
Shutdown-Mode Current: 2µA
o
Wide Operating Temperature Range from -40°C to
+105°C (AEC-Q100, Type 2)
o
9.7mm x 4.4mm, 38-Pin TSSOP Package
o
Lead(Pb)-Free and RoHS Compliant
MAX11080/MAX11081
The MAX11080/MAX11081 are battery-pack fault-moni-
tor ICs capable of monitoring up to 12 lithium-ion (Li+)
battery cells. This device is designed to provide an
overvoltage or undervoltage fault indication when any
of the cells cross the user-selectable threshold for
longer than the set program-delay interval. The over-
voltage levels are pin selectable from +3.3V to +4.8V
in 100mV increments, and have a guaranteed accura-
cy of ±25mV over the entire temperature range. The
undervoltage level is also user selectable from +1.6V
to +2.8V in 200mV increments. These levels are guar-
anteed to ±100mV over the entire temperature range.
Undervoltage detection can be disabled as one of the
user-configuration options.
The MAX11080/MAX11081 have a built-in level-shifter
that allows up to 31 MAX11080/MAX11081 devices to
be connected in a daisy-chain fashion to reduce the
number of interface signals needed for large stacks of
series batteries. Each cell is monitored differentially and
compared to the overvoltage and undervoltage thresh-
olds. When any of the cells exceed this threshold for
longer than the set program delay interval, the
MAX11080/MAX11081 inhibit the heartbeat signal from
being passed down the daisy-chain. Built-in compara-
tor hysteresis prevents threshold chattering.
The MAX11080/MAX11081 are designed to be the per-
fect complement to the MAX11068 high-voltage mea-
surement IC for redundant fault-monitoring applications.
This device is offered in a 9.7mm x 4.4mm, 38-pin
TSSOP package with 0.5mm pin spacing. The package
is lead-free and RoHS compliant with an extended
operating temperature range of -40°C to +105°C.
Applications
High-Voltage, Multicell-Series-Stacked Battery
Systems
Electric Vehicles
Hybrid Electric Vehicles
Electric Bikes
High-Power Battery Backup
Solar Cell Battery Backup
Super-Cap Battery Backup
PART
MAX11080GUU/V+
MAX11081GUU/V+
Ordering Information
TEMP RANGE
-40°C to +105°C
-40°C to +105°C
PIN-PACKAGE
38 TSSOP
38 TSSOP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
12-Channel, High-Voltage
Battery-Pack Fault Monitors
MAX11080/MAX11081
ABSOLUTE MAXIMUM RATINGS
HV, VDD
U
, GND
U
, DCIN to AGND.........................-0.3V to +80V
HV to DCIN and C12 ................................................-0.3V to +6V
Cn+1 to Cn, where n = 1 to 11...............................-0.3V to +80V
C1 to C0 ...................................................-0.3V to +20V (Note 1)
C1 to AGND ..............................-0.3V to (V
DCIN
+ 0.6V) (Note 2)
C0 to AGND...........................................................-0.3V to +0.9V
C2–C12 to AGND ....................................-0.3V to (V
DCIN
+ 0.6V)
SHDN,
V
AA
to AGND ................................................-0.3V to +4V
VDD
U
to GND
U
.........................................................-0.3V to +6V
OVSEL_, UVSEL_, TOPSEL to AGND .........-0.3V to (V
AA
+ 0.3V)
CD, ALRM
L
to AGND..................................-0.3V to (V
AA
+ 0.3V)
ALRM
U
to GND
U
...................................-0.3V to (+VDD
U
+ 0.3V)
CP+ to AGND ...........................(GND
U
- 0.3V) to (VDD
U
+ 0.3V)
CP- to AGND...........................................-0.3V to (GND
U
+ 0.3V)
CP- to VDD
U
.......................................................................+0.3V
ESD Rating
C_, REF, V
AA
, VDD
U,
GND
U
,
DCIN,
SHDN,
CP+, CP-, HV,
OVSEL_, UVSEL_, TOPSEL,
ALRM
U
, ALRM
L
,
AGND, CD
..............................
±2kV (Human Body Model, Note 3)
Continuous Power Dissipation (T
A
= +70°C)
38-Pin TSSOP (derate 15.9mW/°C above +70°C) ....1095.9mW
Operating Temperature Range .........................-40°C to +105°C
Storage Temperature Range .............................-55°C to +150°C
Junction Temperature (continuous) .................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1:
The C1 to C0 differential input path is tolerant to 80V as long as the
SHDN
pin is deasserted.
Note 2:
The C1 input is tolerant to a maximum V
DCIN
+ 0.6V with
SHDN
= 1. If
SHDN
= 0, 20V is the maximum rating.
Note 3:
Human Body Model to Specification MIL-STD-883 Method 3015.7.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(T
A
= T
MIN
to T
MAX
, unless otherwise noted. V
DCIN
= V
GND
U
= +6.0V to +72V, typical values are at T
A
= +25°C, unless otherwise
specified from -40°C to +105°C.)
PARAMETER
C_ INPUTS
Any two inputs Cn to Cn+1,
where n = 1 to 11 (Note 4)
Differential Input Range
VCELL
XIN
C1 to C0 with
SHDN
= 1
C1 to C0 with
SHDN
= 0
Input Current
Overvoltage Threshold
Overvoltage-Threshold Accuracy
Undervoltage Threshold
Undervoltage-Threshold
Accuracy
Comparator Hysteresis (Note 4)
CD PIN
CD Current
CD Trip Voltage
Delay-Time Accuracy
STATUS/CONTROL PORT
Shutdown Disable (SHDN High
Voltage)
Shutdown Asserted (SHDN Low
Voltage)
SHDN/V
IH
SHDN/V
IL
2.1
0.6
V
V
I
CD
V
CD
V
CD
= 0.4V
Internal at comparator
Excluding C
DLY
variation
4.35
6.1
1.23
±20
7.65
µA
V
%
V
HYS
MAX11080
MAX11081
12
V
UV
+1.6
±20
300
37.5
77
IC
XIN
V
OV
V
CELL
= 3.0V
1.5
1.5
1.5
-1
+3.3
±5
0.05
72
72
16
+1
+4.8
±25
+2.8
±100
µA
V
mV
V
mV
mV
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
12-Channel, High-Voltage
Battery-Pack Fault Monitors
ELECTRICAL CHARACTERISTICS (continued)
(T
A
= T
MIN
to T
MAX
, unless otherwise noted. V
DCIN
= V
GND
U
= +6.0V to +72V, typical values are at T
A
= +25°C, unless otherwise
specified from -40°C to +105°C.)
PARAMETER
VDD
U
Output High
VDD
U
Output Low
ALRM
L
Output Voltage High
ALRM
L
Output Voltage Low
SYMBOL
VDD
U
V
OH
VDD
U
V
OL
ALRM
L
V
OH
ALRM
L
V
OL
ALRM
U
V
IH
I
SOURCE
= 150µA
I
SINK
= 150µA
Daisy-chained ALRM
U
signal as
coupled through a 3.3nF high-voltage
capacitor and a 150kΩ resistor as
referred to GND
U
Daisy-chained ALRM
U
signal as
coupled through a 3.3nF high-voltage
capacitor and a 150kΩ resistor as
referred to GND
U
Heartbeat clock rate with no alarm
condition
Heartbeat clock rate with no alarm
condition
V
DCIN
V
AAOUT
6V < V
DCIN
< 72V, I
LOAD
= 0A
I
AASHORTCIRCUIT
V
AA
= 0V, 6V < V
DCIN
< 36V
V
AARESET
Falling V
AA
V
AAVALID
V
AAHYS
Thermal Shutdown
T
SHUT
POWER-SUPPLY REQUIREMENTS (DCIN)
Operating mode,
SHDN
= 1, 12
battery cells, alarm inactive,
V
DCIN
= V
GND
U
= 36V
Shutdown mode,
SHDN
= 0, 12
battery cells, V
DCIN
= V
GND
U
= 36V
I
GND
U
Operating Mode
LOGIC INPUTS AND OUTPUTS
Threshold Setting
V
IH
V
IL
UVSEL0/UVSEL1/UVSEL2, TOPSEL
OVSELO/OVSEL1/OVSEL2/OVSEL3
V
AA
- 0.1
0.1
V
SHDN
= 1, battery cells, alarm
inactive, V
DCIN
= V
GND
U
= 36V
35
40
µA
1.3
35
2
40
µA
Rising V
AA
Hysteresis on rising V
AA
Rising temperature
V
GND
U
+ 2.1
2.4
0.6
CONDITIONS
MIN
V
GND
U
+ 2.4
V
GND
U
+ 0.3
TYP
MAX
UNITS
V
V
V
V
MAX11080/MAX11081
ALRM
U
Input Voltage High
V
ALRM
U
Input Voltage Low
Alarm Voltage Output “Heartbeat”
Frequency
Alarm Voltage Output Duty Cycle
LINEAR REGULATOR (V
AA
)
Input-Voltage Range
Output Voltage
Short-Circuit Current
Power-On-Reset Trip Level
(Note 5)
ALRM
U
V
IL
ALRM
L
f
OUT
V
GND
U
+ 0.9
4032
49.0
4096
4157
51.0
V
Hz
%
6
3.0
3.3
2.8
3.0
37
+145
72
3.6
50
V
V
mA
V
mV
°C
Current Consumption
I
DCIN
Note 4:
Limits guaranteed by design and characterization statistical analysis, not production tested.
Note 5:
Guaranteed by design and not production tested.
_______________________________________________________________________________________
3
12-Channel, High-Voltage
Battery-Pack Fault Monitors
MAX11080/MAX11081
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
UNDERVOLTAGE SET THRESHOLD
vs. TEMPERATURE
MAX11080 toc01
UNDERVOLTAGE CLEAR THRESHOLD
vs. TEMPERATURE (MAX11080)
MAX11080 toc02
OVERVOLTAGE SET THRESHOLD
vs. TEMPERATURE
4.8V SET POINT
OVERVOLTAGE SET THRESHOLD (V)
4.804
4.802
4.800
4.798
4.796
4.794
4.792
MIN
MEAN
MAX
MAX11080 toc03
MAX11080 toc06
1.64
UNDERVOLTAGE SET THRESHOLD (V)
1.63
1.62
1.61
1.60
1.59
1.58
1.57
1.56
1.55
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
MIN
MEAN
MAX
1.6V SET POINT
1.94
UNDERVOLTAGE CLEAR THRESHOLD (V)
1.6V SET POINT
1.92
1.90
1.88
1.86
1.84
1.82
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
MIN
MEAN
MAX
4.806
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
OVERVOLTAGE CLEAR THRESHOLD
vs. TEMPERATURE (MAX11080)
OVERVOLTAGE CLEAR THRESHOLD (V)
4.8V SET POINT
4.53
4.52
4.51
4.50
4.49
4.48
4.47
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
MIN
MAX
MAX11080 toc04
CD CURRENT DISTRIBUTION
MAX11080 toc05
CD CHARGING CURRENT
vs. TEMPERATURE
6.03
V
CD
= 0.4V
6.02
CD CURRENT (µA)
6.01
6.00
5.99
5.98
5.97
5.96
4.54
35
30
25
DEVICE COUNT
20
15
10
5
0
5.4
5.6
5.8
6.0
6.2
6.4
MEAN
6.6
-40
-20
0
20
40
60
80
100
CD PIN CURRENT (µA)
TEMPERATURE (°C)
DCIN SUPPLY CURRENT vs. V
DCIN
70
60
I
DCIN
(µA)
50
40
30
T
A
= +25°C
20
0
10
20
30
40
V
DCIN
(V)
50
60
70
80
T
A
= -40°C
T
A
= +105°C
I
GNDU
(µA)
4.8V OVERVOLTAGE THRESHOLD
V
CELL
= V
DCIN
/12
MAX11080 toc07
GND
U
SUPPLY CURRENT
vs. GND
U
VOLTAGE
50
45
40
35
30
25
20
15
0
10
20
30
40
50
60
70
80
V
GNDU
(V)
T
A
= +25°C
T
A
= -40°C
MAX11080 toc08
55
T
A
= +105°C
4
_______________________________________________________________________________________
12-Channel, High-Voltage
Battery-Pack Fault Monitors
Pin Description
PIN
1
2
3, 33
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
NAME
DCIN
HV
N.C.
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
UVSEL0
UVSEL1
UVSEL2
OVSEL0
OVSEL1
OVSEL2
OVSEL3
Overvoltage Threshold Select 0 to 3. Used to select one of 16 overvoltage alarm threshold settings.
The parts have internal pulldown; these pins should only be tied to V
AA
or AGND to set the logic state.
Undervoltage Threshold Select 0 to 2. Used to select one of eight undervoltage alarm threshold settings.
The parts have internal pulldown; these pins should only be tied to V
AA
or AGND to set the logic state.
FUNCTION
DC Power-Supply Input. DCIN supplies the internal 3.3V regulator. This pin should be connected as shown
in the application diagrams.
High-Voltage Bias. HV is biased by the output of the charge pump to provide a DC supply above the DCIN
level. It is used internally to bias the cell-comparator circuitry. Bypass to DCIN with a 1µF capacitor.
No Connection. Not internally connected.
Cell 12 Plus Connection. Top of battery module stack.
Cell 12 Minus Connection and Cell 11 Plus Connection
Cell 11 Minus Connection and Cell 10 Plus Connection
Cell 10 Minus Connection and Cell 9 Plus Connection
Cell 9 Minus Connection and Cell 8 Plus Connection
Cell 8 Minus Connection and Cell 7 Plus Connection
Cell 7 Minus Connection and Cell 6 Plus Connection
Cell 6 Minus Connection and Cell 5 Plus Connection
Cell 5 Minus Connection and Cell 4 Plus Connection
Cell 4 Minus Connection and Cell 3 Plus Connection
Cell 3 Minus Connection and Cell 2 Plus Connection
Cell 2 Minus Connection and Cell 1 Plus Connection
Cell 1 Minus Connection. Connect to AGND.
MAX11080/MAX11081
_______________________________________________________________________________________
5
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