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AD7280A:  Lithium Ion Battery Monitoring System

Product Details

Product Status:Recommended for New Designs

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

FEATURES and BENEFITS

  • 12-bit ADC, 1 μs per channel conversion time
  • 6 analog input channels,
    CM range 0.5 V to 27.5 V
  • 6 auxiliary ADC Inputs
  • ±1.6 mV cell voltage accuracy
  • On-chip voltage regulator
  • Cell balancing interface
  • Daisy-chain interface
  • Internal reference: ±3 ppm/°C
  • 1.8 μA power-down current
  • High input impedance
  • Serial interface with alert function
  • See data sheet for additional features

Functional Block Diagram for AD7280A

Evaluation Kits & Symbols & Footprints

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Companion Products

Suggested Companion Products


Recommended Battery Safety Monitor for the AD7280A

  • For creating a fail-safe circuit and safe environment to the user, we recommend the AD8280.
Recommended Current Sense Amplifiers for the AD7280A
  • For a wide array of automotive and power management applications, we recommend the AD8217, AD8218 or the AD8219.
Recommended Digital Isolators for the AD7280A
  • For dual channel, bidirectional communication, we recommend the ADuM1201.
  • For a quad channel with integrated DC/DC converter, we recommend the ADuM5401.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7280A Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7280ABSTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $5.09 $4.33 Y  Material Info PCN Purchase Sample
AD7280ABSTZ-RL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $4.33 Y  Material Info PCN Purchase
AD7280AWBSTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $5.09 $4.33 Y  Material Info PCN Purchase Sample
AD7280AWBSTZ-RL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $4.33 Y  Material Info PCN Purchase
Price Table Help

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.

AD7280A Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7280AEDZ Status: Production Evaluation Board $150.00 Yes -
EVAL-CED1Z Status: Production Evaluation Board $249.00 Yes -

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.

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