LM4893MM/NOPB

Audio Amplifiers Overview

The LM4893MM/NOPB is a 1.1 Watt audio power amplifier in an MSOP-8 package, designed for mobile phones and portable devices. It delivers 1.1W to an 8Ω BTL load at 5V with <1% THD+N. Operating voltage ranges from 2.2V to 5.5V. Quiescent current is 5mA (typ) at 5V; shutdown current is 0.1µA (typ). PSRR is 62dB (typ) at 217Hz. Output offset voltage is 5mV (typ).

Audio Amplifiers Feature Summary

• Bridge-tied load (BTL) configuration eliminates the need for output coupling capacitors.
• Advanced pop and click circuitry minimizes audible transients during power transitions.
• Ultra-low current shutdown mode reduces power consumption when inactive.
• Internal thermal shutdown protection safeguards against overheating.

Audio Amplifiers Applications

• Mobile phones
• Personal Digital Assistants (PDAs)
• Portable electronic devices

Audio Amplifiers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolete product notices, as datasheets indicate this specific part may be discontinued. Ensure the ordering suffix matches the required package type and environmental specifications before finalizing procurement orders.

Audio Amplifiers Selection Notes

Select this amplifier for applications requiring high efficiency without external output capacitors. The BTL architecture doubles output swing compared to single-ended designs. Verify that the system supply voltage falls within the 2.2V to 5.5V range. Consider the MSOP-8 package constraints for thermal management and PCB space limitations in compact portable designs.

Audio Amplifiers Part Context

The LM4893 belongs to the Boomer family of audio amplifiers developed by National Semiconductor, now Texas Instruments. This series focuses on providing high-quality audio output with minimal external components. The LM4893 specifically targets low-power portable applications where space and battery life are critical design parameters.

Audio Amplifiers Replacement Considerations

Datasheet identifies LM4893ITL and LM4893MA as alternative order numbers for different packages. No other specific substitute part numbers are documented in the provided source material.

Audio Amplifiers FAQ

Does the LM4893 require output coupling capacitors?

No, the bridge-tied load (BTL) configuration allows it to drive loads directly without output coupling capacitors.

How is the shutdown function controlled?

Driving the SHUTDOWN pin to logic low (ground) turns off the amplifier's bias circuitry to minimize idle current.