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
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.
- Battery cell testing & formation
- Battery module testing
Product Lifecycle 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 (1)
The AD8450-EVALZ contains many user-friendly features to facilitate evaluating AD8450 performance. Numerous connectors, test loops and points facilitate attaching scope probes and cables, and I/O switches conveniently exercise various device options.
Additionally, the eval board is configurable for evaluating the performance of the AD8450 with a closed loop environment.
See AD8450 data sheet for additional information.
Tools & Simulations
ADIsimPE, which is powered by SIMetrix/SIMPLIS, is a circuit simulation suite optimized for the design and development of analog and mixed signal circuits. SIMetrix mode is ideal for the simulation of general non-switching circuits. It provides full Pspice compatibility for use with industry-standard SPICE models. SIMPLIS (SIMulation Piecewise-Linear System) mode simulates the operation of switching circuits with vastly improved robustness, speed, and accuracy compared to standard SPICE. It is particularly useful for switching power supply, PLLs, and ADC/DAC applications.
AD8450 Companion Parts
Recommended Battery Testing and Formation
- For battery testing and formation application: ADP1972.
Technical Articles (1)
Analog Dialogue (1)
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.
Sample & Buy
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.