LM4674TL

• Output short-circuit protection
• Stereo Class D operation
• No output filter required
• Logical selection gain
• Independent shutdown control
• Minimal external components
• Click inhibition
• Micropower shutdown
• Save 2 mm x 2 mm x 0.6 mm micro SMD and 4mm x 4 mm x 0.8 mm LLP package in available space

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The LM4674 is a single-supply, high-efficiency, 2.5W/channel, filter-switched audio amplifier. A low-noise PWM architecture eliminates the need for output filters, reduces the number of external components, board area consumption, system cost, and simplifies design.

The LM4674 is designed to meet the needs of mobile phones and other portable communication devices. The device operates from a single 5V supply and is capable of delivering less than 10% THD+N 2.5W/channel continuous output power to a 4Ω load Flexible power requirements allow operation from 2.4V to 5.5V.

The LM4674 is highly efficient compared to traditional Class AB amplifiers. When driving an 8Ω speaker from a 3.6V power supply, the device functions at 85% efficiency at P O = 500MW. The four gain options are pin-selected via the G0 and G1 pins.

Output short-circuit protection against damage to equipment under fault conditions. Advanced click suppression eliminates audible transient noise when power-up/down and off. Independent left/right shutdown control for hybrid mono/stereo applications maximizes power savings.

Key specifications:

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• mobile phone
• handheld computer
• laptop