LM4558 Dual OP-Amp IC Datasheet

Introduction

The LM4558 integrated circuit (IC) is a popular and versatile dual operational amplifier (op-amp). This IC is widely used in various electronic circuits due to its general-purpose nature, providing two independent, high-gain, and frequency-compensated op-amps in a single package. The dual configuration of the LM4558 allows engineers to perform two distinct amplification or signal-processing functions simultaneously, making it a valuable component for space-constrained designs and multi-stage circuits. Its key features, such as a high common-mode input voltage range and the absence of latch-up, make it a reliable choice for diverse applications.

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The LM4558 is a go-to choice for a wide range of op-amp applications, including comparators, differential amplifiers, and circuits designed for mathematical operations like summing and differencing. Its robust design is particularly well-suited for voltage-follower applications, where its ability to handle a high common-mode input voltage without latch-up ensures stable and accurate signal buffering. The dual op-amp configuration of the LM4558 significantly enhances its utility, allowing for more complex circuit designs to be implemented efficiently. This makes it a cost-effective and space-saving solution in consumer electronics, industrial controls, and audio equipment. The LM4558 IC is a staple in hobbyist projects and professional designs alike, valued for its reliability and functional flexibility.

LM4558 Dual OP-Amp IC

LM4558 Pinout

Key Features of LM4558 Dual OP-Amp IC

The LM4558 is a versatile and widely used dual operational amplifier (op-amp) IC. Its key features make it a reliable and convenient choice for a variety of electronic applications.

• Dual Op-Amp Configuration: It contains two independent, internally compensated, high-gain op-amps in a single package. This allows it to perform two separate functions, which is highly useful in circuits requiring multiple stages or functions.
• Internal Frequency Compensation: The IC is designed with built-in frequency compensation. This ensures stable operation without the need for external components to prevent unwanted oscillations, simplifying circuit design.
• Continuous Short-Circuit Protection: The device includes built-in protection against short circuits, enhancing its durability and reliability in different operating conditions.
• No Latch-Up: The LM4558 is designed to prevent “latch-up,” a condition where the IC gets stuck in a high-current state and can be damaged. This makes it ideal for applications like voltage followers.
• Wide Voltage Ranges: It has a wide common-mode and differential voltage range, allowing it to function reliably with a variety of input signals.
• Gain and Phase Matching: The two op-amps within the IC are designed to have closely matched gain and phase characteristics, which is crucial for applications requiring balanced channels, such as in stereo audio circuits.
• Low Noise: The IC is known for its low noise input transistors, making it suitable for noise-sensitive applications, particularly in audio preamplifiers and mixers.
• Parameter Tracking: The device’s parameters track well over its operating temperature range, ensuring consistent performance.
• Wide Supply Voltage Range: It can operate on both single and dual power supplies, typically from ±5V to ±15V (or higher, depending on the specific variant), providing flexibility for different power supply designs.

Electrical Characteristics of LM4558 Dual OP-Amp IC

• Input Offset Voltage (VIO​): Typically around 0.5 mV. This is a measure of the voltage needed at the input to make the output zero.
• Input Bias Current (IIB​): Typically 80 nA. This is the average current flowing into the input pins.
• Large-Signal Differential Voltage Amplification (AVD​): A high open-loop gain, typically around 100 V/mV.
• Common-Mode Rejection Ratio (CMRR): High, typically 80 dB. This indicates the op-amp’s ability to reject common-mode noise.
• Supply Current (ICC​): Typically 3.5 to 5.6 mA (for both amplifiers, with no load).
• Slew Rate (SR): Typically 1.7 V/µs. This is the maximum rate of change of the output voltage.
• Gain-Bandwidth Product (GBW): Typically around 3 MHz. This represents the frequency at which the open-loop gain drops to unity (1).
• Operating Temperature Range: Generally, it is characterized for operation from 0°C to 70°C, though some variants may have a wider range.

More Circuit Layouts

Key Applications of LM4558 Dual OP-Amp IC

• Mathematical operations
• Amplifiers
• Oscillators
• Voltage comparators
• Peak detectors
• Logic voltage translation
• Industrial
• Measuring instruments
• Audio
• Automotive

Equivalent ICs of LM4558

LM158, LM258, LM358, LM2904, LM747

Datasheet of LM4558 Dual OP-Amp IC

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