AD8280 Datasheet PDF - Analog Devices
| Part Number | AD8280 | |
| Description | Lithium Ion Battery Safety Monitor | |
| Manufacturers | Analog Devices | |
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Data Sheet
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
APPLICATIONS
Lithium ion battery backup monitor and threshold detection
Electric and hybrid electric vehicle
Industrial vehicle
Uninterruptible power supply
Wind and solar
The AD8280 is a hardware-only safety monitor for lithium ion
battery stacks. The device has inputs to monitor six battery cells
and two temperature sensors (either NTC or PTC thermistors).
The device is designed to be daisy-chained with additional AD8280
devices to monitor a stack of significantly more than six cells
without the need for numerous isolators. The output can be
configured for an independent or shared alarm state.
The AD8280 functions independently from a primary
monitor and contains a reference and LDO, both of which are
powered completely from the battery cell stack. The reference, in
conjunction with external resistor dividers, establishes 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 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 automotive
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.
FUNCTIONAL BLOCK DIAGRAM
OT
VTOP LDO
LDOS REF FB
AIINOV AIINUV AIINOT ENBO TESTO
UV OV
VTOPS
VBOT2
VBOT2S
VBOT1
VBOT1S
VIN6
VIN5
VIN4
VIN3
LDO
LEVEL
SHIFTER
REF
C6O
DE-
GLITCHING
C6U
DE-
GLITCHING
I/V
CONVERTER
LEVEL
SHIFTER
DGT0
DGT1
DGT2
GND2
SELF-
TEST
GENERATOR
GND1
VCC
VCCS
TOP
BOT
VIN2
VIN1
VIN0
LEVEL
SHIFTER
VT1
VT2
AD8280
C1O
DE-
GLITCHING
C1U
DE-
GLITCHING
CT1
DE-
GLITCHING
DE-
CT2 GLITCHING
ALARM
LOGIC
V/I
CONVERTER
SEL0
SEL 1
AVOUTOV
AVOUTUV
AVOUTOT
NPTC
ALRMSEL
OT
AIOUTOV
AIOUTUV AIOUTOT
ENBI TESTI
OT
Figure 1.
Rev. E
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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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2010–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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AD8280
Parameter
Self-Test Completion Time, tST
Self-Test Valid Time, tSTV
Delay Time for Self-Test Start, tRE
Delay Time for Data Valid, tFE
Rise Time for Self-Test Pulse, tR
POWER SUPPLY
Supply Voltage Range
Quiescent Current
Power Supply Enabled
Power Supply Disabled
Test Conditions/Comments
Deglitch time = 0.0 sec
Deglitch time > 0.0 sec
TESTI
VTOP with respect to VBOTx
LDO source current = 10.0 mA
LDO source current = 0.0 mA
Excluding LDO source current
Data Sheet
Min Typ Max Unit
15 25 ms
650
1000
ms
0.0 2.0 µs
6.0 µs
6.0 µs
1.0 ms
7.5 30 V
6.0 30 V
2.0 mA
1.0 µA
Rev. E | Page 4 of 25
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| Information | Total 26 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AD8280.PDF Datasheet ] | |
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