Overview
The MAX4080TAUA+T is a precision high-side current-sense amplifier developed by Maxim Integrated (now part of Analog Devices). It is designed to accurately measure current in high-voltage applications without interfering with the ground path. The device operates over a wide supply voltage range of 4.5V to 76V, making it suitable for automotive, industrial, and telecom systems. This IC integrates a high-precision amplifier with a fixed gain of 20V/V, 50V/V, or 100V/V (depending on variant), eliminating the need for external gain-setting resistors. Its TSSOP-8 package offers a compact footprint for space-constrained designs while maintaining excellent thermal performance.
Structure and Working Principle
The MAX4080TAUA+T consists of a precision operational amplifier, a trimmed resistor network, and protection circuitry. It operates by measuring the voltage drop across an external shunt resistor placed in series with the load. The differential voltage across the shunt is amplified by the internal gain stage and presented as a single-ended output voltage referenced to ground. The device incorporates built-in protection features including reverse-battery protection (-20V) and overvoltage tolerance (up to 76V). The internal architecture minimizes common-mode rejection ratio (CMRR) errors, ensuring accurate measurements even with high common-mode voltages.
Key Features
The MAX4080TAUA+T offers several distinguishing features that make it preferred for demanding applications. Its ultra-low offset voltage (±100µV maximum) enables accurate measurement of small currents, while the 0.5% maximum gain error ensures precision across the operating temperature range (-40°C to +125°C). The device provides excellent power supply rejection ratio (PSRR) of 120dB (DC) and 80dB (at 50kHz), making it resilient to power supply noise. Its wide bandwidth (200kHz for G=20V/V version) allows for fast current monitoring in switching power systems. The integrated EMI filtering reduces sensitivity to high-frequency interference common in automotive environments.
Application Areas
The MAX4080TAUA+T finds extensive use in industrial automation systems for motor current monitoring, overload detection, and predictive maintenance. Its high-voltage capability makes it suitable for automotive applications including electric vehicle battery management, LED driver current control, and powertrain monitoring. In power electronics, the IC is commonly employed in DC-DC converters, AC-DC power supplies, and solar inverters for current feedback control. Telecom infrastructure equipment utilizes it for power amplifier bias current monitoring and base station power management. The device's robustness also makes it ideal for harsh environment applications like industrial motor drives and welding equipment.
Maintenance and Precautions
Proper handling and installation are crucial for optimal performance of the MAX4080TAUA+T. While the device is robust, ESD precautions should be observed during handling. The PCB layout should minimize trace lengths between the shunt resistor and IC inputs to reduce noise pickup. Thermal management is generally not critical due to the low power dissipation, but adequate copper area should be provided for the thermal pad in high ambient temperature applications. The input pins should not be subjected to voltages beyond the specified maximum ratings, and proper decoupling capacitors (typically 0.1µF ceramic) should be placed close to the power supply pins.
B2B Procurement Guide
When procuring MAX4080TAUA+T in volume, buyers should first verify they are selecting the correct gain variant (suffix indicates gain: F for 20V/V, S for 50V/V, T for 100V/V). Lead times can vary based on market conditions, so establishing relationships with authorized distributors is recommended for reliable supply. Quality-conscious buyers should insist on original factory packaging with proper moisture sensitivity level (MSL) indicators. For automotive applications, confirm availability of the AEC-Q100 qualified version if required. Pricing typically follows volume breaks at 100, 1k, and 10k pieces, with additional discounts negotiable for larger annual commitments. Newer alternatives like the MAX40007 might offer improved specifications for some applications.
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