LM4851ITL

Audio Amplifiers Overview

The LM4851ITL is an integrated audio amplifier system manufactured by National Semiconductor. It operates on a supply voltage range of 2.6V to 5V and delivers up to 1.5W of output power into a 4-ohm load. The device utilizes Class AB topology and features a 18-uSMD package measuring 1.97x2.23 mm. Key electrical characteristics include support for mono operation with stereo headphone outputs.

Audio Amplifiers Feature Summary

• Integrated depop circuitry to eliminate speaker popping noises during power transitions
• Serial Peripheral Interface (SPI) control for digital volume adjustment and configuration
• Built-in thermal protection to safeguard the device under high temperature conditions
• Dedicated shutdown mode to minimize current consumption when the system is inactive

Audio Amplifiers Applications

• Portable multimedia players requiring low-power audio amplification
• Mobile phones and smartphones with integrated speaker systems
• Personal digital assistants (PDAs) and handheld communication devices
• MP3 players and portable media receivers

Audio Amplifiers Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the specific suffix, such as NOPB, which indicates lead-free compliance. Ensure the package type matches the required surface mount footprint. Check for authenticity through authorized distributors to avoid counterfeit components. Validate that the operating voltage range meets your system design requirements.

Audio Amplifiers Selection Notes

Select this component for applications requiring a compact solution with digital control capabilities. The SPI interface allows for precise volume management without additional analog components. Consider the thermal performance if the device will operate in enclosed spaces. The low supply voltage requirement makes it suitable for battery-powered devices. Verify that the output power specifications meet the acoustic requirements of the target speakers.

Audio Amplifiers Part Context

This part belongs to the Boomer series of audio amplifiers from National Semiconductor. The series focuses on delivering high-quality audio in small form factors. It is designed for consumer electronics where space and power efficiency are critical constraints. The integration of control interfaces reduces the overall bill of materials for manufacturers.

Audio Amplifiers Replacement Considerations

The LM4851ITL/NOPB is a verified lead-free variant of this component. Ensure compatibility with existing PCB layouts when substituting. Verify that the pinout remains identical to avoid redesign efforts. Check datasheet updates for any changes in electrical characteristics or recommended operating conditions.