Lithium Ion Battery Safety Monitor
AD8280
FEATURES
GENERAL DESCRIPTION
Wide supply voltage range: 6.0 V to 30.0 V
Multiple inputs can monitor 3 to 6 cell voltages
and 2 temperatures
Adjustable threshold levels: overvoltage, undervoltage,
overtemperature
Alarm options: separate or shared alarms
Extended temperature range performance
−40°C ≤ TA ≤ +105°C
Can be daisy-chained
Internal reference
Powered from battery stack
LDO available to power isolator
Qualified for automotive applications
Extensive self-test feature aids in meeting ASIL/SIL
requirements
The AD8280 is a hardware-only safety monitor for lithium ion
battery stacks. The part has inputs to monitor six battery cells
and two temperature sensors (either NTC or PTC thermistors).
The part is designed to be daisy-chained with other AD8280
devices to monitor a stack of significantly more than six cells
without the need for numerous isolators. Its output can be con-
figured for an independent or shared alarm state.
The AD8280 functions independently from a primary monitor
and contains its own reference and LDO, both of which are
powered completely from the battery cell stack. The reference, in
conjunction with external resistor dividers, is used to establish
trip points for the overvoltages and undervoltages. Each cell
channel contains programmable deglitching circuitry to prevent
alarms from transient input levels.
The AD8280 also has two digital pins that can be used to select
various combinations of inputs in the case where fewer than six
cells are to be monitored. Most important, it has a self-test feature,
making it suitable for high reliability applications, such as auto-
motive hybrid electric vehicles or higher voltage industrial usage,
such as uninterruptible power supplies. The AD8280 can function
over a temperature range of −40°C to +105°C.
APPLICATIONS
Lithium ion battery backup monitor and threshold detection
Electric and hybrid electric vehicle
Industrial vehicle
Uninterruptible power supply
Wind and solar
FUNCTIONAL BLOCK DIAGRAM
OT
AIINOV AIINUV AIINOT ENBO
TESTO
VTOP LDO
LDOS REF FB
UV
OV
DGT0
DGT1
DGT2
GND2
GND1
VCC
VTOPS
LEVEL
SHIFTER
VBOT2
VBOT2S
VBOT1
LDO
REF
VBOT1S
SELF-
TEST
GENERATOR
DE-
C6O
C6U
I/V
GLITCHING
VIN6
VIN5
CONVERTER
LEVEL
SHIFTER
VCCS
DE-
GLITCHING
TOP
BOT
VIN4
VIN3
VIN2
SEL0
SEL 1
ALARM
LOGIC
VIN1
VIN0
DE-
C1O
GLITCHING
LEVEL
SHIFTER
AVOUTOV
DE-
GLITCHING
C1U
CT1
CT2
AVOUTUV
AVOUTOT
VT1
VT2
DE-
GLITCHING
V/I
CONVERTER
NPTC
DE-
GLITCHING
ALRMSEL
AD8280
OT
AIOUTOV
AIOUTUV AIOUTOT
ENBI TESTI
OT
Figure 1.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2010-2011 Analog Devices, Inc. All rights reserved.
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