LM4875MM/NOPB

Audio Amplifiers Overview

The LM4875MM/NOPB is a Class AB audio power amplifier IC manufactured by Texas Instruments, formerly National Semiconductor. It operates on a single supply voltage ranging from 2.7 V to 5.5 V. The device delivers 1 W of continuous average power into an 8-ohm load and 110 mW into a 32-ohm load. It features a precision DC volume control and integrated headphone amplifier. The component is housed in an 8-VSSOP package and supports operation within a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Integrates a precision DC volume control for accurate signal attenuation without external components.
• Includes an internal headphone amplifier stage designed for direct driving of low-impedance loads.
• Provides comprehensive protection mechanisms including thermal shutdown, mute, and pop-and-click suppression.

Audio Amplifiers Applications

• Portable media players requiring high-fidelity mono audio output
• Mobile phones with integrated headphone jack functionality
• Digital voice recorders and dictaphones
• MP3 players and portable navigation devices

Audio Amplifiers Procurement Notes

Verify the manufacturer designation carefully, as the part was originally produced by National Semiconductor before its acquisition by Texas Instruments. Ensure the suffix /NOPB is present to confirm lead-free compliance and RoHS adherence. Confirm the specific package variant (VSSOP) matches your PCB footprint requirements, as pinouts may differ from other LM4875 derivatives.

Audio Amplifiers Selection Notes

Select this component when a single-channel solution with built-in volume adjustment and headphone drive capability is required. It is suitable for applications where board space is limited due to the compact VSSOP packaging. Consider the 2.7 V minimum supply voltage to ensure compatibility with battery-powered systems. Verify that the 1 W output power at 8 ohms meets the speaker requirements for the target application.

Audio Amplifiers Part Context

The LM4875 series belongs to the Boomer family of audio amplifiers. This specific model integrates both the main power amplifier and a dedicated headphone driver, simplifying the design for mono audio systems. It replaces older discrete solutions or separate amplifier chips by combining multiple functions into a single IC, reducing component count and assembly costs.

Audio Amplifiers Replacement Considerations

Direct substitutes include LM4875M/NOPB and LM4875MX/NOPB, which share similar electrical characteristics but differ in package type (SOIC vs. VSSOP). Cross-reference with LM4876 series if stereo output is needed, though pinouts and configurations will vary significantly.

Audio Amplifiers FAQ

Does the LM4875MM/NOPB support stereo audio output?

No, the LM4875MM/NOPB is a mono amplifier. It provides one channel for main audio output and an additional headphone amplifier stage, but it does not drive two independent stereo channels simultaneously.

What is the purpose of the DC volume control feature?

The DC volume control allows for precise attenuation of the audio signal using external resistors connected to a dedicated pin. This eliminates the need for external potentiometers, saving board space and improving reliability in portable devices.