LM4890LDX/NOPB

Audio Amplifiers Overview

The LM4890LDX/NOPB is a 1-watt audio power amplifier designed for mobile phones and portable communication devices. It delivers continuous average power to an 8-ohm bridged-T (BTL) load with less than 1% distortion from a 5VDC supply. The device operates within a voltage range of 2.2V to 5.5V and features ultra-low current shutdown mode, achieving typical shutdown currents of 0.1µA. It incorporates advanced pop and click circuitry to eliminate noises during turn-on and turn-off transitions. The amplifier does not require output coupling capacitors, snubber networks, or bootstrap capacitors, making it suitable for low-voltage applications where minimal power consumption is critical.

Audio Amplifiers Feature Summary

• Features an ultra-low current shutdown mode activated by driving the shutdown pin logic low to minimize idle power consumption.
• Includes internal thermal shutdown protection to safeguard the device against overheating conditions.
• Utilizes advanced pop and click circuitry to prevent audible noises during power-up and power-down sequences.
• Capable of driving capacitive loads directly through its bridged-T (BTL) output configuration.

Audio Amplifiers Applications

• Mobile Phones
• Personal Digital Assistants (PDAs)
• Portable Electronic Devices

Audio Amplifiers Procurement Notes

Verify that the component matches the specific LD package designation and NOPB suffix requirements. Confirm the datasheet revision status aligns with your design specifications. Ensure proper PCB layout practices are followed, particularly regarding the exposed die attach paddle soldering for thermal management. Validate that external component values meet the application's gain and filtering needs.

Audio Amplifiers Selection Notes

Select this amplifier for single-supply applications requiring high efficiency without output coupling capacitors. Consider the WSON package for space-constrained designs needing effective thermal dissipation via the exposed pad. Evaluate system gain settings to ensure optimal power supply rejection ratio performance. Verify compatibility with available supply voltages ranging from 2.2V to 5.5V.

Audio Amplifiers Part Context

This component belongs to Texas Instruments' Boomer audio power amplifier series, engineered for high-quality output with minimal external components. The LM4890 family includes various package options such as DSBGA, VSSOP, SOIC, and WSON. The LD variant specifically refers to the WSON package with an exposed die attach paddle for enhanced thermal performance in compact portable electronics.

Audio Amplifiers Replacement Considerations

Consult official documentation for direct substitutes. Cross-reference package dimensions and pinouts when considering alternative amplifiers. Verify electrical characteristics match original design constraints.