The LM4874MH is a Boomer audio power amplifier capable of delivering 1.1W of continuous average power into an 8Ω load with less than 1% THD+N from a 5V power supply. Manufactured by Texas Instruments (formerly National Semiconductor), it is designed for portable audio devices and other low-voltage applications where power efficiency and space are critical.

Applications

• Cell phones
• Laptop computers
• Portable media players
• Personal digital assistants (PDAs)
• PCMCIA cards

Features

• 1.1W output power into 8Ω
• Low THD+N (typically 0.1% at 1W)
• Integrated shutdown function
• Short-circuit protection
• Thermal shutdown protection
• Available in thermally efficient MLP package

Benefits

• Provides sufficient audio output power for portable devices.
• Delivers high-quality audio reproduction with low distortion.
• Extends battery life with its high efficiency.
• Protects the device from damage due to short circuits or overheating.
• Reduces board space and component count with its integrated features.

Additional Details

The LM4874MH utilizes a bridge-tied load (BTL) configuration, which allows it to deliver more power to the load compared to a single-ended amplifier with the same supply voltage. The integrated shutdown function reduces power consumption when the device is not in use, further extending battery life. The short-circuit protection prevents damage to the amplifier and the connected speaker in case of a short circuit condition. The thermal shutdown protection automatically disables the amplifier when it reaches a critical temperature, preventing overheating and damage. The MLP (Micro Leadframe Package) provides excellent thermal performance, allowing the amplifier to dissipate heat effectively and operate at higher power levels. The device is designed for ease of use and requires minimal external components, simplifying the design process. The LM4874MH is ideal for applications where size, power efficiency, and audio quality are important considerations.