MAX4491AUA+

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4491AUA+ is a dual-channel, low-cost CMOS operational amplifier featuring rail-to-rail input and output capabilities. It operates from a single 2.7V to 5.5V supply or dual ±1.35V to ±2.75V supplies with a typical supply current of 800µA per amplifier. Key electrical parameters include a gain-bandwidth product of 10MHz, a slew rate of 10V/µs, an input offset voltage of ±10mV (max), and an input bias current of ±2.5nA (max). The device maintains unity-gain stability with capacitive loads up to 300pF and drives resistive loads to within 55mV of either supply rail.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Rail-to-rail input common-mode voltage range and output voltage swing for maximum dynamic range in low-voltage applications.
• High slew rate of 10V/µs and 10MHz gain-bandwidth product for fast signal processing.
• Unity-gain stable with capacitive loads up to 300pF without external compensation components.
• Low supply current consumption suitable for battery-powered and portable equipment.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery-powered instruments
• Portable equipment
• Audio signal conditioning
• Sensor amplifiers
• High-side/low-side current sensors

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific package variant, as the MAX4491 series includes SOT23-8 and µMAX-8 options. Confirm that the selected component matches the required channel count and temperature range specifications. Ensure compatibility with the intended supply voltage levels and load conditions before finalizing procurement decisions.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when rail-to-rail I/O performance is required at low supply voltages. It is suitable for general-purpose amplification where moderate speed and low cost are prioritized over precision. Consider the input capacitance effects on stability when using high-value feedback resistors.

Instrumentation, Op Amps, Buffer Amps Part Context

The MAX4491AUA+ belongs to the MAX4490/MAX4491/MAX4492 family of low-cost, high-slew-rate, rail-to-rail I/O op amps. This family offers single, dual, and quad configurations respectively, sharing identical electrical characteristics while differing in channel count and package options such as SC70, SOT23, TSSOP, and µMAX.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct functional replacements within the same family include the MAX4490 (single channel) and MAX4492 (quad channel). Verify pinout compatibility and package dimensions when substituting between different package types like SOT23-8 and µMAX-8.

Instrumentation, Op Amps, Buffer Amps FAQ

What is the maximum capacitive load the MAX4491AUA+ can drive while remaining stable?

The MAX4491AUA+ remains unity-gain stable with capacitive loads up to 300pF.

How does the input stage design affect input capacitance?

The parallel-connected N- and P-channel differential input stages result in a relatively large input capacitance, typically 5pF.