LM4953SD/NOPB

Audio Amplifiers Overview

The LM4953SD/NOPB is a Boomer audio power amplifier designed for driving ceramic speakers in portable applications. It features a low-noise inverting charge pump that generates an internal negative supply, enabling ground-referenced outputs without external DC blocking capacitors. The device operates on a single supply voltage ranging from 1.6V to 4.2V. In mono bridge-tied-load (BTL) configuration with a 2μF + 30Ω load at 3.6V, it delivers a 12.6Vpp output swing with less than 1% THD+N. Key electrical characteristics include a maximum shutdown current of 1µA and a typical quiescent current of 7mA.

Audio Amplifiers Feature Summary

• Integrated low-noise inverting charge pump eliminates the need for large output coupling capacitors.
• Advanced pop and click circuitry prevents audible transients during power-up and shutdown transitions.
• Automatic standby mode reduces power consumption by entering low-current state after three seconds of silence.
• Unity-gain stable design requires no bootstrap capacitors or snubber circuits.

Audio Amplifiers Applications

• Ceramic speaker drivers in mobile phones
• Audio amplification in personal digital assistants (PDAs)
• Portable display applications requiring high power and minimal size

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and reel specifications. Ensure compatibility with RoHS and environmental standards required for the target assembly process. Confirm availability status as active for new designs before finalizing procurement plans.

Audio Amplifiers Selection Notes

Select this component for applications requiring ground-referenced BTL drive to maximize dynamic range without output capacitors. Evaluate thermal dissipation requirements based on ambient temperature and load impedance. Consider the automatic standby feature for battery-operated systems to extend operational life during silent periods.

Audio Amplifiers Part Context

This device belongs to Texas Instruments' Boomer audio power amplifier series. These amplifiers are engineered to deliver high-quality output power with minimal external components. The LM4953 specifically targets portable markets where space constraints and low power consumption are critical design parameters.

Audio Amplifiers Replacement Considerations

LM4953SDBD is a related variant within the same product family.