LM358P: Comprehensive Analysis of Classic Low-Power Dual Operational Amplifiers

The LM358P is a low-power dual operational amplifier specifically designed for single-supply systems. It contains two independent high-gain operational amplifiers with internal frequency compensation. It has a wide operating voltage range and is widely used in analog signal processing, control systems and general amplification scenarios.

Features

• Wide supply range of 3V to 36V (B, BA versions)

• Quiescent current: 300µA/ch (B, BA versions)

• Unity-gain bandwidth of 1.2MHz (B, BA versions)

• Common-mode input voltage range includesground, enabling direct sensing near ground

• 2mV input offset voltage maximum at 25°C (BAversion)

• 3mV input offset voltage maximum at 25°C (A, Bversions)

• Internal RF and EMI filter (B, BA versions)

• On products compliant to MIL-PRF-38535, allparameters are tested unless otherwise noted. Onall other products, production processing does notnecessarily include testing of all parameters.

Applications

1. Commercial Network and Server Power Supply Units (PSUs)

Use: Used in voltage and current sensing circuits to amplify and filter output signals.

Functions:

Overvoltage/undervoltage comparator

Current feedback control amplifier

Error amplifier for PWM control loops

2. Multifunction Printers (e.g., Inkjet, Laser)

Use: Processes sensor signals and assists in drive control.

Functions:

Amplifies paper sensor signals

Feedback loop for printhead temperature monitoring

Signal conditioning for motor position sensing

3. Power Supplies and Mobile Chargers

Use: Monitors battery voltage and current to ensure safe charging.

Functions:

Voltage comparator for overvoltage/undervoltage protection

Error amplifier in constant voltage/current control loop

Current sensing amplifier for feedback control

4. Motor Control (AC Induction, Brushed/Brushless DC, High/Low Voltage, Permanent Magnet, Stepper Motors)

Use: Integral to feedback control systems.

Functions:

Current sensing and amplification (e.g., Hall sensor signals)

Closed-loop feedback for speed and position control

Temperature and load detection via comparator

5. Desktop Computers and Motherboards

Use: Monitors system voltage, current, and temperature.

Functions:

Error amplifier in power management ICs

Temperature sensor signal processing (e.g., thermistors)

Power rail voltage comparison and protection

6. Indoor and Outdoor Air Conditioners

Use: Processes environmental sensing and control signals.

Functions:

Temperature and humidity sensor signal amplification

Wind speed or pressure sensor signal conditioning

Voltage/current comparison in control loops

7. Washing Machines, Dryers, and Refrigerators

Use: Interfaces with various sensors for feedback and control.

Functions:

Water level sensor signal conditioning

Motor current detection and control

Temperature control signal amplification and comparison

8. AC Inverters, String Inverters, Central Inverters, and Frequency Converters

Use: Amplifies voltage/current sensing for feedback control.

Functions:

Error amplifier in sine wave control

Current feedback for closed-loop control

Voltage detection and over/under-voltage comparator

9. Uninterruptible Power Supplies (UPS)

Use: Monitors battery and power states, supports control logic.

Functions:

Battery voltage and current sensing amplification

Voltage threshold comparators for switching

Control signal amplification and conditioning

10. Electronic Point of Sale (POS) Systems

Use: Signal interface, power management, and battery control.

Functions:

Error amplifier in power regulation feedback circuits

Signal filtering for buttons or touch inputs

Battery level detection and comparison

Package

PINOUT

D, DDF, DGK, P, PS, PW, and JGPackage8-Pin SOIC,

SOT23-8, VSSOP, PDIP, SO, TSSOP,and CDIPTop View

D, DDF, DGK, P, PS, PW, and JGPackage8-Pin SOIC,

SOT23-8, VSSOP, PDIP, SO, TSSOP,and CDIPTop View

Absolute Maximum Ratings

Conclusion

The LM358P is a classic operational amplifier chip that remains resilient despite its age. Although it has been on the market for many years, it still plays a core role in a large number of products to this day. Whether beginners are learning analog circuits or engineers are designing actual products, it provides a stable and reliable solution.

If you need a low-cost, easy-to-use and highly compatible dual operational amplifier chip, the LM358P is undoubtedly one of your top choices.