AD7280A

Lithium Ion Battery Monitoring System
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Product Details

The AD7280A contains all the functions required for general-purpose monitoring of stacked lithium ion batteries as used in hybrid electric vehicles, battery backup applications, and power tools. The part has multiplexed cell voltage and auxiliary ADC measurement channels for up to six cells of battery management. An internal ±3 ppm reference is provided that allows a cell voltage accuracy of ±1.6 mV. The ADC resolution is 12 bits and allows conversion of up to 48 cells within 7 μs.

The AD7280A operates from just one VDD supply that has a range of 8 V to 30 V (with an absolute maximum rating of 33 V). The part provides six differential analog input channels to accommodate large common-mode signals across the full VDD range. Each channel allows an input signal range, VIN(+) − VIN(−), of 1 V to 5 V. The input pins assume a series stack of six cells. In addition, the part includes six auxiliary ADC input channels that can be used for temperature measurement or system diagnostics.

The AD7280A includes on-chip registers that allow a sequence of channel measurements to be programmed to suit the applications requirements.

The AD7280A also includes a dynamic alert function that can detect if the cell voltages or auxiliary ADC inputs exceed an upper or lower limit defined by the user. The AD7280A has cell balancing interface outputs designed to control external FET transistors to allow discharging of individual cells.

The AD7280A includes a built in self-test feature that internally applies a known voltage to the ADC inputs.

There is a daisy-chain interface that allows up to eight parts to be stacked without the need for individual device isolation.

The AD7280A requires only one supply pin that takes 6.5 mA under normal operation, while converting at 1 MSPS.

All this functionality is provided in a 48-lead LQFP package operating over a temperature range of −40°C to +105°C.

Applications

  • Lithium ion battery monitoring
  • Electric and hybrid electric vehicles
  • Power supply back up
  • Power tools

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits

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Product Details

The EVAL-AD7280AEDZ is a fully featured evaluation Kit for the AD7280A. This board operates in stand alone mode or in conjunction with the Converter Evaluation and Development board, EVAL-CED1Z . When operated with the Converter Evaluation and Development board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the Converter Evaluation and Development board.


Reference Designs

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Product Recommendations

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AD7280A Companion Parts

Recommended Digital Isolators

  • For a quad channel with integrated DC/DC converter , we recommend the ADUM5401 .
  • For dual channel, bidirectional communication , we recommend the ADUM1201 .

Recommended Battery Safety Monitor

  • For creating a fail-safe circuit and safe environment to the user , we recommend the AD8280 .

Recommended Current Sense Amplifiers

  • For a wide array of automotive and power management applications , we recommend the AD8217, AD8218 or the AD8219 .

Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD7280A Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Reviews

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Most Helpful Review

by kapsikum
We are really busy with our business at this moment and ordering AD7280A lithium ion battery monitoring IC was first a bit of a gamble. Then we learned about this linux driver http://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad7280a and the gamble paid off. Especially SPI interface helps monitoring through the cells.

All Reviews

by kapsikum, 10 Jul 13
ad7280a and the ease of use
We are really busy with our business at this moment and ordering AD7280A lithium ion battery monitoring IC was first a bit of a gamble. Then we learned about this linux driver http://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad7280a and the gamble paid off. Especially SPI interface helps monitoring through the cells.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.