AD8450ASTZ-RL

Overview

The AD8450ASTZ-RL is a precision analog front end and controller designed for battery cell formation and testing systems. It integrates constant current (CC) and constant voltage (CV) modes with automatic switchover, supporting both charge and discharge operations. The device features a programmable gain instrumentation amplifier (PGIA) for current sensing with gains of 26, 66, 133, and 200 V/V, and a programmable gain difference amplifier (PGDA) for voltage sensing with gains of 0.2, 0.27, 0.4, and 0.8 V/V. It includes internal laser-trimmed resistor networks, fault detection comparators, and a current sharing bus. The component operates within an ambient temperature range of −40°C to +85°C and is housed in an 80-lead LQFP package measuring 14 mm × 14 mm × 1 mm.

Feature Summary

• Integrated CC/CV control with automatic transparent switching between modes
• Precision PGIA with fixed gains of 26, 66, 133, and 200 V/V and CMRR up to 126 dB at gain 200
• Precision PGDA with fixed gains of 0.2, 0.27, 0.4, and 0.8 V/V
• Built-in overvoltage and overcurrent fault detection with TTL-compliant logic output

Applications

• Battery cell formation and testing
• Battery module testing

Procurement Notes

Verify the specific ordering suffix 'ASTZ-RL' against the manufacturer's official documentation to confirm package type, temperature grade, and reel packaging specifications. Ensure compatibility with the required supply voltages (AVCC: 5 V to 36 V; AVEE: −31 V to 0 V; DVCC: 3 V to 5 V) during system design validation.

Selection Notes

Select this component for applications requiring high-precision current and voltage monitoring in battery test equipment. The integrated loop filter amplifiers and direct interface to PWM controllers simplify the design of constant current and constant voltage loops. Verify that the required gain settings for the PGIA and PGDA align with the internal fixed options provided by the device architecture.

Part Context

The AD8450 is part of Analog Devices' portfolio of precision analog front ends specialized for power management and battery applications. It serves as a dedicated controller for battery formation systems, replacing discrete solutions for current sensing, voltage measurement, and loop control. The device consolidates multiple functional blocks into a single IC to reduce board space and improve measurement accuracy.

Replacement Considerations

Public confirmed substitute part numbers are not available in the verified source material.