AD8450:  Precision Analog Front End and Controller for Battery Test/Formation Systems

Product Details

Product Status:Recommended for New Designs

The AD8450 is a precision analog front end for testing and monitoring battery cells. Referring to figure one, a precision programmable gain instrumentation amplifier (PGIA) measures the battery’s charge/discharge current and a programmable gain difference amplifier (PGDA) measures the battery’s voltage. Internal laser trimmed resistor networks set the gains for the PGIA and the PGDA, optimizing the AD8450’s performance over the rated temperature range. PGIA gains are 26×, 66×, 133×, and 200×. PGDA gains are 0.2×, 0.27×,0.4×, and 0.8×.

Voltages at the ISET and VSET inputs set the desired constant voltage (CV) and constant current (CC) values. CC to CV switching is automatic and transparent to the system.

A TTL level logic input, MODE, selects between charge and discharge modes (high for charge, low for discharge). An analog output, VCTRL, interfaces directly with ADI’s ADP1972 & ADP1974 PWM controllers.

The AD8450 includes resistor programmable overvoltage and overcurrent detection and current sharing circuitry. Current sharing is used to balance charge among multiple batteries. The AD8450 simplifies designs by providing excellent accuracy, performance over temperature, flexibility with functionality, and overall reliability in a space-saving package. The AD8450 is available in an 80 lead 14 mm ×14 mm × 1 mm LQFP package and is rated at −40 °C to +85 °C operating temperature.

APPLICATIONS

  • Battery cell testing & formation
  • Battery module testing

FEATURES and BENEFITS

  • Integrated constant current and voltage modes with automatic switchover
  • Charge and Discharge modes
  • Precision voltage and current measurement
  • Integrated precision control feedback blocks
  • Precision interface to PWM or linear power converters
  • Programmable gain settings
    Current sense gains:
    26, 66, 133, 200
    Voltage sense gains:
    0.2, 0.27, 0.4, 0.8
  • Programmable OVP, OCP fault detection
  • Current sharing & balancing
  • Excellent ac & dc performance
  • See datasheet for additional features

Functional Block Diagram for AD8450

Similar Products

  • AD8451: Low Cost Precision Analog Front End and Controller for Battery Test/Formation Systems

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8450 SPICE Macro Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD8450 Model Options
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.


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