LM4900MM/NOPB

Audio Amplifiers Overview

The LM4900MM/NOPB is a bridged audio power amplifier delivering 265mW into an 8Ω load at 3.3V supply with 1% THD+N. It operates from 2.0V to 5.5V, drawing 4mA quiescent current and 0.1µA in shutdown. The device features thermal protection, click/pop suppression, and external gain configuration via resistors. Packaged in MSOP-8, it eliminates the need for output coupling capacitors or bootstrap circuits.

Audio Amplifiers Feature Summary

• Bridged architecture providing differential drive without output coupling capacitors
• Externally controlled shutdown mode minimizing idle power consumption
• Integrated thermal shutdown protection circuitry
• Latest generation click and pop suppression technology

Audio Amplifiers Applications

• Cellular phones
• Personal Digital Assistants (PDAs)
• Portable audio applications

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix matches the required package type, as the LM4900 family includes MSOP, LLP, and SOP variants. Confirm RoHS compliance status through official manufacturer documentation. Ensure the component source is an authorized distributor to guarantee authenticity and traceability of the Texas Instruments product.

Audio Amplifiers Selection Notes

Select this amplifier for low-voltage portable designs requiring high efficiency without external bootstrap components. The unity-gain stability allows flexible closed-loop gain configuration using external resistors. Consider the exposed paddle thermal performance if utilizing higher supply voltages or driving lower impedance loads to manage internal power dissipation effectively.

Audio Amplifiers Part Context

Part of the Boomer® audio power amplifier series designed for minimal external component counts. Originally developed by National Semiconductor, now supported by Texas Instruments. The MM suffix denotes the 8-lead Mini Small Outline Package suitable for surface mount assembly in space-constrained portable electronic devices.

Audio Amplifiers Replacement Considerations

LM4900M

Audio Amplifiers FAQ

Does the LM4900 require output coupling capacitors?

No, the bridged configuration biases outputs at half-supply, eliminating net DC voltage across the load and removing the need for output coupling capacitors.

How is the amplifier gain configured?

The closed-loop gain is set externally by the ratio of feedback resistor RF to input resistor Ri, while the second internal amplifier remains fixed in a unity-gain inverting configuration.