Texas Instruments

LM4889MM

LM4889MM Description

The LM4889MM from Texas Instruments is a monolithic Class AB audio power amplifier designed for portable and low-voltage applications. Housed in an 8-VSSOP package, it delivers 1W of continuous output power into an 8Ω load with a supply voltage range of 2.2V to 5.5V, making it ideal for battery-powered devices. As part of TI’s Boomer® series, it combines efficiency with high-quality audio performance. The device is obsolete but remains relevant for legacy designs, offering robust thermal protection and depop circuitry to minimize audible artifacts during power transitions.

LM4889MM Features

• Output Power: 1W per channel into 8Ω, suitable for small speakers or headphones.
• Low Voltage Operation: 2.2V–5.5V supply range optimizes battery life in portable electronics.
• Integrated Protection: Features thermal shutdown and depop circuitry to prevent damage and reduce turn-on/off noise.
• Shutdown Mode: Reduces quiescent current to <1µA, extending battery life in standby.
• Surface-Mount Design: Compact VSSOP-8 package saves PCB space in space-constrained applications.
• REACH & ECCN Compliance: Meets environmental and export control standards (EAR99, REACH Unaffected).

LM4889MM Applications

• Portable Audio Devices: MP3 players, handheld gaming consoles, and Bluetooth speakers.
• Mobile Phones & Tablets: Auxiliary audio amplification for improved sound output.
• IoT & Wearables: Low-power audio solutions for smartwatches or wireless earbuds.
• Legacy Systems: Maintenance or repair of older designs requiring a proven Class AB amplifier.

Conclusion of LM4889MM

The LM4889MM excels in low-voltage, compact audio amplification, offering a balance of performance and efficiency. While obsolete, its thermal protection, depop features, and shutdown mode make it a reliable choice for legacy or low-power audio systems. Engineers valuing space savings and battery longevity in portable designs may still find this IC advantageous despite newer alternatives.