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
- Fixed gain settings
Current sense gain: 26 V/V (typ)
Voltage sense gain: 0.8 V/V (typ)
- Excellent ac and dc performance
- Maximum offset voltage drift:
- Maximum gain drift: 3 ppm/°C
- Low current sense amplifier input voltage noise: >9 nV/√Hz typ
- Current sense CMRR:
108 dB minimum
- TTL compliant logic
The AD8451 is a precision analog front end and controller for testing and monitoring battery cells. A precision fixed gain instrumentation amplifier (IA) measures the battery charge/discharge current, and a fixed gain difference amplifier (DA) measures the battery voltage. Internal laser trimmed resistor networks set the gains for the IA and the DA, optimizing the performance of the AD8451 over the rated temperature range. The IA gain is 26 and the DA gain is 0.8.
Voltages at the ISET and VSET inputs set the desired constant current (CC) and constant voltage (CV) values. CC to CV switching is automatic and transparent to the system.
A TTL logic level input, MODE, selects the charge or discharge mode (high for charge, low for discharge). An analog output, VCTRL, interfaces directly with the Analog Devices, Inc., ADP1972 PWM controller.
The AD8451 simplifies designs by providing excellent accuracy, performance over temperature, flexibility with functionality, and overall reliability in a space-saving package. The AD8451 is available in an 80-lead, 14 mm × 14 mm × 1 mm LQFP package and is rated for an operating temperature of −40°C to +85°C.
- Battery cell formation and testing
- 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 AD8451-EVALZ evaluation board is a convenient standalone platform for evaluating the major elements of the AD8451, either as a standalone component or connected to a battery test/formation system.
In the configuration, the AD8451-EVALZ operates just as it would within a system including the PWM and dc-to-dc power converter. Please refer to data sheet AD8451 for details.
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.
AD8451 Companion Parts
Recommended Battery Testing and Formation
- For battery testing and formation application: ADP1972.
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.