LM4926TLX/NOPB

Audio Amplifiers Overview

The LM4926TLX/NOPB is a stereo headphone amplifier manufactured by Texas Instruments. It delivers 80mW of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V supply. The device operates within a voltage range of 1.6V to 4.2V and features an internal fixed gain of 1.5V/V. It utilizes a charge pump for ground-referenced outputs, eliminating the need for output coupling capacitors. Key electrical parameters include a shutdown current of 0.01µA (typical) and a PSRR of 70dB at 217Hz.

Audio Amplifiers Feature Summary

• Ground-referenced outputs enabled by an internal inverting charge pump that generates a negative reference voltage, removing the requirement for large DC blocking capacitors.
• Advanced pop and click suppression circuitry eliminates audible transients during turn-on, turn-off, and recovery from shutdown modes.
• Automatic standby mode reduces quiescent current consumption after approximately 12 seconds of no input signal, recovering instantly upon signal detection.
• Independent micro-power shutdown capability for left and right channels via active-low control pins.

Audio Amplifiers Applications

• Notebook PCs
• Mobile Phones
• PDAs
• Portable Electronic Devices
• MP3 Players

Audio Amplifiers Procurement Notes

Verify the NRND status before implementation, as this indicates the component is not recommended for new designs. Confirm package integrity for the DSBGA YZE format. Ensure design reviews account for the specific pinout functions, particularly the separate SD_LC and SD_RC shutdown controls. Validate thermal dissipation requirements against ambient temperature constraints defined in the datasheet.

Audio Amplifiers Selection Notes

Select this component for low-voltage audio applications requiring minimal external components due to the integrated charge pump. Consider the automatic standby feature for battery-operated devices where power conservation during silence is critical. Evaluate the fixed 1.5V/V gain configuration against system input levels. Verify compatibility with the DSBGA package size constraints for space-sensitive portable electronics.

Audio Amplifiers Part Context

This part belongs to the LM4926 series of ground-referenced, ultra-low noise audio amplifiers. It is designed specifically for mobile phone and other low-voltage applications where minimal power consumption and small form factors are primary requirements. The device integrates two operational amplifiers in a single package, offering high-quality output power with minimal external circuitry.

Audio Amplifiers Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.