LM4925MM/NOPB

Audio Amplifiers Overview

The LM4925MM/NOPB is a stereo audio power amplifier from the Boomer series, designed for portable two-cell battery applications. It operates on a single supply voltage ranging from 1.5V to 3.6V. The device supports both Single-Ended (SE) and Bridged-Tied Load (BTL) configurations. In SE mode, it delivers 40mW per channel into a 16Ω load at 1% THD+N with a 3.0V supply. In BTL mode, it provides 410mW into an 8Ω load under identical conditions. Key electrical specifications include a quiescent current of 1.0mA typical and a shutdown current of 0.1µA typical.

Audio Amplifiers Feature Summary

• Supports flexible operation in either Single-Ended stereo headphone or Bridged-Tied Load mono speaker modes via external pin control.
• Integrates click-and-pop suppression circuitry to minimize output transients during device turn-on and turn-off events.
• Features micro-power shutdown capability that significantly reduces supply current consumption when the amplifier is inactive.
• Includes thermal shutdown protection to safeguard the device against overheating under fault conditions.

Audio Amplifiers Applications

• Portable two-cell audio products
• Stereo headphone amplification
• Mono speaker driving via BTL configuration
• Portable two-cell electronic devices

Audio Amplifiers Procurement Notes

Verify the package type matches the specific suffix; the MM suffix indicates a VSSOP package. Confirm RoHS compliance status as indicated by the NOPB designation. Ensure the operating supply voltage range aligns with the system's battery architecture, specifically between 1.5V and 3.6V. Check for availability of the DGS package number reference if PCB layout details are required.

Audio Amplifiers Selection Notes

Select this component for low-voltage portable systems requiring high efficiency and minimal external components. Choose BTL mode for higher power delivery to speakers, or SE mode for direct headphone connection. Consider the trade-off between shutdown time and pop-click performance when sizing the bypass capacitor. Ensure the load impedance matches the specified minimums for optimal power output and thermal management.

Audio Amplifiers Part Context

The LM4925 belongs to Texas Instruments' Boomer audio power amplifier series, which focuses on providing high-quality output power in surface-mount packages with few external components. It is part of the broader LM49xx family of audio amplifiers designed for consumer electronics. The device utilizes a dual operational amplifier architecture within a single package to support its stereo or bridged configurations.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.