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Overview
Features and Benefits
- 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
Product Details
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.
Applications
- Lithium ion battery backup monitor and threshold detection
- Electric and hybrid electric vehicle
- Industrial vehicle
- Uninterruptible power supply
- Wind and solar
ADI's AD8280 won the power management sub-category for the development of a new chip that monitors the voltage and temperature of lithium-ion battery stacks in hybrid and electric vehicles.
Product Lifecycle
Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
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