MAX11080(2009) データシートの表示（PDF） - Maxim Integrated
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MAX11080 Datasheet PDF : 27 Pages
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12-Channel, High-Voltage Battery-Pack
Fault Monitor
HV
6V
DCIN
C12
C1 TO C11
6V
80V 80V
80V
VDDU
CP+
ALRMU
GNDU
CP-
ESD DIODES
MAX11080
C0
AGND
4V
4V
6V
VAA
ALRML
SHDN
CD
TOPSEL
OVSEL0/1/2/3
UVSEL0/1/2
Figure 6. ESD Diode Diagram
Detailed Description
Figure 1 shows the functional diagram; Figure 2 shows
the application circuit diagram for a 12-cell system
while Figure 3 shows the application circuit design for a
10-cell system and Figure 4 for an 8-cell system. Figure
5 is the application schematic for the battery module
system with redundant fault detection.
Architectural Overview
The MAX11080 is a battery-pack fault-monitor IC capa-
ble of monitoring up to 12 Li+ battery cells. This device
is designed to provide an overvoltage or undervoltage
alarm indicator when any of the cells cross the user-
selectable threshold for longer than the configured
decision delay interval. The MAX11080 also incorpo-
rates a daisy-chain bus for use in high-voltage stacked-
battery operation. The daisy-chain bus relays shutdown
and alarm communication across up to 31 stacked
modules without the need for isolation between each
module. This results in a simplified system with reduced
cost. The MAX11080 is ideal as an ultra-low-power,
redundant cell fault monitor that is the perfect comple-
ment to the MAX11068 high-voltage battery measure-
ment IC. Both ICs in concert form a powerful Li+ battery
system monitor with redundant overvoltage and under-
voltage fault detection.
Overvoltage and Undervoltage Fault
Detection
Figure 7 summarizes the fault-detection mechanism for
a set of differential cell inputs in the MAX11080.
First, the differential cell inputs are attenuated by a fac-
tor of four while being level-shifted and converted to a
single-ended voltage referenced to AGND. The ground-
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