LM4985TM/NOPB

Audio Amplifiers Overview

The LM4985 is a stereo audio power amplifier featuring an internal digitally controlled volume control. It operates within a supply voltage range of 2.3V to 5.5V and supports both Output Capacitor-Less (OCL) and capacitively coupled output configurations. The device delivers up to 135mW per channel into a 16Ω load at 5V operation with 1% THD+N. Key electrical characteristics include ultra-low shutdown current, high power supply rejection ratio, and low total harmonic distortion plus noise.

Audio Amplifiers Feature Summary

• Integrated I2C bus interface for digital analog volume control
• Configurable OCL or capacitively coupled output modes
• Ultra-low current shutdown mode for micropower dissipation
• Optimized for minimal external component count

Audio Amplifiers Applications

• Mobile phones
• PDAs
• Portable electronic devices
• MP3 players

Audio Amplifiers Procurement Notes

Verify the specific package marking and date code against the manufacturer's latest production data sheet. Confirm that the ordering suffix matches the required tape-and-reel or cut-tape configuration. Ensure the I2C logic levels align with the system microcontroller before finalizing procurement.

Audio Amplifiers Selection Notes

Select this component for applications requiring integrated volume adjustment without external digital potentiometers. Evaluate the thermal performance based on the expected load impedance and supply voltage. Consider the wake-up time from shutdown when designing power management sequences for battery-operated systems.

Audio Amplifiers Part Context

This part belongs to Texas Instruments' Boomer AudioPower Amplifier Series. It is designed specifically to provide high-quality output power while minimizing PCB area through the elimination of bootstrap capacitors, snubber networks, and large output coupling capacitors in OCL mode.

Audio Amplifiers Replacement Considerations

Check for updated revisions such as LM4985T/NOPB. Verify pin compatibility if substituting with other TI stereo amplifiers like the LM4910x series, noting differences in package type and control interfaces.